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Re: Oil Consumption 2000 JGC V-8
Aside from all the other comments, if it is suddenly using more oil than
normal, then ignoring it will just accelerate engine deterioration over time. The oil contamination creates excess carbon deposits that increase wear throughout the engine -- especially the piston rings. It could be that the valve seals are going bad. I would think that valve seals may be fairly easy on that engine -- once the cam covers are removed. Just getting them off may be a challenge in itself since they're sizeable magnesium castings and there are things in the way. One possibility would be to determine if there's any blue smoke in certain situations. It may be faint so you may have to ride in a second vehicle trailing your Jeep on a sunny day and watch carefully for puffs of blue smoke. For example, if there's a puff of blue smoke upon initial acceleration after idling for a minute, I think that would suggest a valve seal issue, since the higher manifold vacuum draws more oil down the valve guides into the cylinder during deceleration and idling. It's not burned much during that idling/deceleration phase, but then when power is applied the oil is suddenly burned, creating the puff of blue smoke. If you see any blue smoke but it's fairly constant, rather than a puff here and there, that would probably suggest worn rings. This is certainly a possibility since, on the 4.7L, the distance from the top ring groove to the top of the piston is only 1/8 of an inch. That 'dead space' between the piston and cylinder wall above the top ring tends to trap unburned fuel, so reducing that space improves emissions. But then the rings are more susceptible to wear and heat since they're pushed closer to the combustion chamber. The wrist pins also tend to be higher up on the piston nowadays to allow use of longer connecting rods for improved torque, and this means thinner rings which are more crowded together at the top of the piston. The oil consumption may not be great enough to create noiceable blue smoke, though. And, of course, there are other possibilities. A head gasket problem could allow oil to seep into a coolant passage, so make sure no oil is getting into the coolant... "James" <jnipperxxx@nospamfdn.com> wrote in message news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. > > > This Jeep has 125,000 miles. Runs good, no problem. I have used Mobil > 1 > synthetic oil since it was new. > > The engine used almost no oil until I got to about 110,000 miles. After > that, I started noticing that it was using some oil, which I thought was > normal. After now paying closer attention, I see that it now uses one > quart > every 3,000 miles. > > Is this fairly normal oil consumption ? > > Thanks for any comments. > > --James-- > > |
Re: Oil Consumption 2000 JGC V-8
Aside from all the other comments, if it is suddenly using more oil than
normal, then ignoring it will just accelerate engine deterioration over time. The oil contamination creates excess carbon deposits that increase wear throughout the engine -- especially the piston rings. It could be that the valve seals are going bad. I would think that valve seals may be fairly easy on that engine -- once the cam covers are removed. Just getting them off may be a challenge in itself since they're sizeable magnesium castings and there are things in the way. One possibility would be to determine if there's any blue smoke in certain situations. It may be faint so you may have to ride in a second vehicle trailing your Jeep on a sunny day and watch carefully for puffs of blue smoke. For example, if there's a puff of blue smoke upon initial acceleration after idling for a minute, I think that would suggest a valve seal issue, since the higher manifold vacuum draws more oil down the valve guides into the cylinder during deceleration and idling. It's not burned much during that idling/deceleration phase, but then when power is applied the oil is suddenly burned, creating the puff of blue smoke. If you see any blue smoke but it's fairly constant, rather than a puff here and there, that would probably suggest worn rings. This is certainly a possibility since, on the 4.7L, the distance from the top ring groove to the top of the piston is only 1/8 of an inch. That 'dead space' between the piston and cylinder wall above the top ring tends to trap unburned fuel, so reducing that space improves emissions. But then the rings are more susceptible to wear and heat since they're pushed closer to the combustion chamber. The wrist pins also tend to be higher up on the piston nowadays to allow use of longer connecting rods for improved torque, and this means thinner rings which are more crowded together at the top of the piston. The oil consumption may not be great enough to create noiceable blue smoke, though. And, of course, there are other possibilities. A head gasket problem could allow oil to seep into a coolant passage, so make sure no oil is getting into the coolant... "James" <jnipperxxx@nospamfdn.com> wrote in message news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. > > > This Jeep has 125,000 miles. Runs good, no problem. I have used Mobil > 1 > synthetic oil since it was new. > > The engine used almost no oil until I got to about 110,000 miles. After > that, I started noticing that it was using some oil, which I thought was > normal. After now paying closer attention, I see that it now uses one > quart > every 3,000 miles. > > Is this fairly normal oil consumption ? > > Thanks for any comments. > > --James-- > > |
Re: Oil Consumption 2000 JGC V-8
Most manufacturers say that 1 quart per 1000 miles can be considered
'normal' so 1 quart in 3000 miles certainly fits in that range. That being said I would be surprised at that amount of wear in an engine where synthetic had been used since new, or seals damaged under those conditions. Another possibility could be stuck piston rings, if you were to add one ounce of SeaFoam to each cylinder through the sparkplug hole and let it soak for a hour or so before reinstalling the spark plug would probably remove any deposits causing the rings to stick. Be advised the engine will product a lot of smoke for a few minutes after a SeaFoam treatment. Sometimes this will break carbon free and cause a misfire, if this happens you may need to clean the plugs (swirl in a bit of SeaFoam) before replacement If you think the seals may be failing you can switch to one of the 'high mileage' (over 75k) motor oils. They claim to help rejuvenate the seal suppleness. I think I would stay with 5w-30 oil, especially in the wintertime weather. "Marcus" <marcuscl@b.n> wrote in message news:ukVXg.44634$8s6.15405@bignews4.bellsouth.net. .. > Aside from all the other comments, if it is suddenly using more oil than > normal, then ignoring it will just accelerate engine deterioration over > time. The oil contamination creates excess carbon deposits that increase > wear throughout the engine -- especially the piston rings. > > It could be that the valve seals are going bad. I would think that valve > seals may be fairly easy on that engine -- once the cam covers are > removed. Just getting them off may be a challenge in itself since they're > sizeable magnesium castings and there are things in the way. > > One possibility would be to determine if there's any blue smoke in certain > situations. It may be faint so you may have to ride in a second vehicle > trailing your Jeep on a sunny day and watch carefully for puffs of blue > smoke. > > For example, if there's a puff of blue smoke upon initial acceleration > after idling for a minute, I think that would suggest a valve seal issue, > since the higher manifold vacuum draws more oil down the valve guides into > the cylinder during deceleration and idling. It's not burned much during > that idling/deceleration phase, but then when power is applied the oil is > suddenly burned, creating the puff of blue smoke. > > If you see any blue smoke but it's fairly constant, rather than a puff > here and there, that would probably suggest worn rings. This is certainly > a possibility since, on the 4.7L, the distance from the top ring groove to > the top of the piston is only 1/8 of an inch. That 'dead space' between > the piston and cylinder wall above the top ring tends to trap unburned > fuel, so reducing that space improves emissions. But then the rings are > more susceptible to wear and heat since they're pushed closer to the > combustion chamber. The wrist pins also tend to be higher up on the > piston nowadays to allow use of longer connecting rods for improved > torque, and this means thinner rings which are more crowded together at > the top of the piston. > > The oil consumption may not be great enough to create noiceable blue > smoke, though. And, of course, there are other possibilities. A head > gasket problem could allow oil to seep into a coolant passage, so make > sure no oil is getting into the coolant... > > "James" <jnipperxxx@nospamfdn.com> wrote in message > news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >> >> >> This Jeep has 125,000 miles. Runs good, no problem. I have used >> Mobil 1 >> synthetic oil since it was new. >> >> The engine used almost no oil until I got to about 110,000 miles. After >> that, I started noticing that it was using some oil, which I thought was >> normal. After now paying closer attention, I see that it now uses one >> quart >> every 3,000 miles. >> >> Is this fairly normal oil consumption ? >> >> Thanks for any comments. >> >> --James-- >> >> > > |
Re: Oil Consumption 2000 JGC V-8
Most manufacturers say that 1 quart per 1000 miles can be considered
'normal' so 1 quart in 3000 miles certainly fits in that range. That being said I would be surprised at that amount of wear in an engine where synthetic had been used since new, or seals damaged under those conditions. Another possibility could be stuck piston rings, if you were to add one ounce of SeaFoam to each cylinder through the sparkplug hole and let it soak for a hour or so before reinstalling the spark plug would probably remove any deposits causing the rings to stick. Be advised the engine will product a lot of smoke for a few minutes after a SeaFoam treatment. Sometimes this will break carbon free and cause a misfire, if this happens you may need to clean the plugs (swirl in a bit of SeaFoam) before replacement If you think the seals may be failing you can switch to one of the 'high mileage' (over 75k) motor oils. They claim to help rejuvenate the seal suppleness. I think I would stay with 5w-30 oil, especially in the wintertime weather. "Marcus" <marcuscl@b.n> wrote in message news:ukVXg.44634$8s6.15405@bignews4.bellsouth.net. .. > Aside from all the other comments, if it is suddenly using more oil than > normal, then ignoring it will just accelerate engine deterioration over > time. The oil contamination creates excess carbon deposits that increase > wear throughout the engine -- especially the piston rings. > > It could be that the valve seals are going bad. I would think that valve > seals may be fairly easy on that engine -- once the cam covers are > removed. Just getting them off may be a challenge in itself since they're > sizeable magnesium castings and there are things in the way. > > One possibility would be to determine if there's any blue smoke in certain > situations. It may be faint so you may have to ride in a second vehicle > trailing your Jeep on a sunny day and watch carefully for puffs of blue > smoke. > > For example, if there's a puff of blue smoke upon initial acceleration > after idling for a minute, I think that would suggest a valve seal issue, > since the higher manifold vacuum draws more oil down the valve guides into > the cylinder during deceleration and idling. It's not burned much during > that idling/deceleration phase, but then when power is applied the oil is > suddenly burned, creating the puff of blue smoke. > > If you see any blue smoke but it's fairly constant, rather than a puff > here and there, that would probably suggest worn rings. This is certainly > a possibility since, on the 4.7L, the distance from the top ring groove to > the top of the piston is only 1/8 of an inch. That 'dead space' between > the piston and cylinder wall above the top ring tends to trap unburned > fuel, so reducing that space improves emissions. But then the rings are > more susceptible to wear and heat since they're pushed closer to the > combustion chamber. The wrist pins also tend to be higher up on the > piston nowadays to allow use of longer connecting rods for improved > torque, and this means thinner rings which are more crowded together at > the top of the piston. > > The oil consumption may not be great enough to create noiceable blue > smoke, though. And, of course, there are other possibilities. A head > gasket problem could allow oil to seep into a coolant passage, so make > sure no oil is getting into the coolant... > > "James" <jnipperxxx@nospamfdn.com> wrote in message > news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >> >> >> This Jeep has 125,000 miles. Runs good, no problem. I have used >> Mobil 1 >> synthetic oil since it was new. >> >> The engine used almost no oil until I got to about 110,000 miles. After >> that, I started noticing that it was using some oil, which I thought was >> normal. After now paying closer attention, I see that it now uses one >> quart >> every 3,000 miles. >> >> Is this fairly normal oil consumption ? >> >> Thanks for any comments. >> >> --James-- >> >> > > |
Re: Oil Consumption 2000 JGC V-8
Most manufacturers say that 1 quart per 1000 miles can be considered
'normal' so 1 quart in 3000 miles certainly fits in that range. That being said I would be surprised at that amount of wear in an engine where synthetic had been used since new, or seals damaged under those conditions. Another possibility could be stuck piston rings, if you were to add one ounce of SeaFoam to each cylinder through the sparkplug hole and let it soak for a hour or so before reinstalling the spark plug would probably remove any deposits causing the rings to stick. Be advised the engine will product a lot of smoke for a few minutes after a SeaFoam treatment. Sometimes this will break carbon free and cause a misfire, if this happens you may need to clean the plugs (swirl in a bit of SeaFoam) before replacement If you think the seals may be failing you can switch to one of the 'high mileage' (over 75k) motor oils. They claim to help rejuvenate the seal suppleness. I think I would stay with 5w-30 oil, especially in the wintertime weather. "Marcus" <marcuscl@b.n> wrote in message news:ukVXg.44634$8s6.15405@bignews4.bellsouth.net. .. > Aside from all the other comments, if it is suddenly using more oil than > normal, then ignoring it will just accelerate engine deterioration over > time. The oil contamination creates excess carbon deposits that increase > wear throughout the engine -- especially the piston rings. > > It could be that the valve seals are going bad. I would think that valve > seals may be fairly easy on that engine -- once the cam covers are > removed. Just getting them off may be a challenge in itself since they're > sizeable magnesium castings and there are things in the way. > > One possibility would be to determine if there's any blue smoke in certain > situations. It may be faint so you may have to ride in a second vehicle > trailing your Jeep on a sunny day and watch carefully for puffs of blue > smoke. > > For example, if there's a puff of blue smoke upon initial acceleration > after idling for a minute, I think that would suggest a valve seal issue, > since the higher manifold vacuum draws more oil down the valve guides into > the cylinder during deceleration and idling. It's not burned much during > that idling/deceleration phase, but then when power is applied the oil is > suddenly burned, creating the puff of blue smoke. > > If you see any blue smoke but it's fairly constant, rather than a puff > here and there, that would probably suggest worn rings. This is certainly > a possibility since, on the 4.7L, the distance from the top ring groove to > the top of the piston is only 1/8 of an inch. That 'dead space' between > the piston and cylinder wall above the top ring tends to trap unburned > fuel, so reducing that space improves emissions. But then the rings are > more susceptible to wear and heat since they're pushed closer to the > combustion chamber. The wrist pins also tend to be higher up on the > piston nowadays to allow use of longer connecting rods for improved > torque, and this means thinner rings which are more crowded together at > the top of the piston. > > The oil consumption may not be great enough to create noiceable blue > smoke, though. And, of course, there are other possibilities. A head > gasket problem could allow oil to seep into a coolant passage, so make > sure no oil is getting into the coolant... > > "James" <jnipperxxx@nospamfdn.com> wrote in message > news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >> >> >> This Jeep has 125,000 miles. Runs good, no problem. I have used >> Mobil 1 >> synthetic oil since it was new. >> >> The engine used almost no oil until I got to about 110,000 miles. After >> that, I started noticing that it was using some oil, which I thought was >> normal. After now paying closer attention, I see that it now uses one >> quart >> every 3,000 miles. >> >> Is this fairly normal oil consumption ? >> >> Thanks for any comments. >> >> --James-- >> >> > > |
Re: Oil Consumption 2000 JGC V-8
billy ray wrote:
> Most manufacturers say that 1 quart per 1000 miles can be considered > 'normal' so 1 quart in 3000 miles certainly fits in that range. Normal?!! 1 qt in 1000 miles would have a cloud following you down the road and 4000 miles to engine seizure. I have over 132,000 Miles and have near zero oil loss between changes. That much oil loss indicates a problem. It may be as simple as a clogged CCV tube or a leaking ring/valve seal. Checking the plugs will tell you if a cyl is burning oil as the plug will be deeply covered or clogged with soot. Oil is known to leak from the rear of the I6 valve cover and even the sides. >> "James" <jnipperxxx@nospamfdn.com> wrote in message >> news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >>> >>> >>> This Jeep has 125,000 miles. Runs good, no problem. I have used >>> Mobil 1 >>> synthetic oil since it was new. >>> >>> The engine used almost no oil until I got to about 110,000 miles. After that, I started noticing that it was using some oil, >>> which I >>> thought was normal. After now paying closer attention, I see that >>> it now uses one quart >>> every 3,000 miles. |
Re: Oil Consumption 2000 JGC V-8
billy ray wrote:
> Most manufacturers say that 1 quart per 1000 miles can be considered > 'normal' so 1 quart in 3000 miles certainly fits in that range. Normal?!! 1 qt in 1000 miles would have a cloud following you down the road and 4000 miles to engine seizure. I have over 132,000 Miles and have near zero oil loss between changes. That much oil loss indicates a problem. It may be as simple as a clogged CCV tube or a leaking ring/valve seal. Checking the plugs will tell you if a cyl is burning oil as the plug will be deeply covered or clogged with soot. Oil is known to leak from the rear of the I6 valve cover and even the sides. >> "James" <jnipperxxx@nospamfdn.com> wrote in message >> news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >>> >>> >>> This Jeep has 125,000 miles. Runs good, no problem. I have used >>> Mobil 1 >>> synthetic oil since it was new. >>> >>> The engine used almost no oil until I got to about 110,000 miles. After that, I started noticing that it was using some oil, >>> which I >>> thought was normal. After now paying closer attention, I see that >>> it now uses one quart >>> every 3,000 miles. |
Re: Oil Consumption 2000 JGC V-8
billy ray wrote:
> Most manufacturers say that 1 quart per 1000 miles can be considered > 'normal' so 1 quart in 3000 miles certainly fits in that range. Normal?!! 1 qt in 1000 miles would have a cloud following you down the road and 4000 miles to engine seizure. I have over 132,000 Miles and have near zero oil loss between changes. That much oil loss indicates a problem. It may be as simple as a clogged CCV tube or a leaking ring/valve seal. Checking the plugs will tell you if a cyl is burning oil as the plug will be deeply covered or clogged with soot. Oil is known to leak from the rear of the I6 valve cover and even the sides. >> "James" <jnipperxxx@nospamfdn.com> wrote in message >> news:xvmdnT1CqaGJT2TZnZ2dnUVZ_rCdnZ2d@comcast.com. .. >>> >>> >>> This Jeep has 125,000 miles. Runs good, no problem. I have used >>> Mobil 1 >>> synthetic oil since it was new. >>> >>> The engine used almost no oil until I got to about 110,000 miles. After that, I started noticing that it was using some oil, >>> which I >>> thought was normal. After now paying closer attention, I see that >>> it now uses one quart >>> every 3,000 miles. |
Re: Oil Consumption 2000 JGC V-8
Ditto, I have never had to add between oil changes of about 3500
miles, on '78 Bronco 350,000, '89 T-bird 300,000 miles without ever having come apart. Using Pennzoil 20/50, no additives oil, nor gas. God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ DougW wrote: > > Normal?!! > 1 qt in 1000 miles would have a cloud following you down the road > and 4000 miles to engine seizure. > > I have over 132,000 Miles and have near zero oil loss between changes. > > That much oil loss indicates a problem. It may be as simple as > a clogged CCV tube or a leaking ring/valve seal. > > Checking the plugs will tell you if a cyl is burning oil > as the plug will be deeply covered or clogged with soot. > > Oil is known to leak from the rear of the I6 valve cover and > even the sides. |
Re: Oil Consumption 2000 JGC V-8
Ditto, I have never had to add between oil changes of about 3500
miles, on '78 Bronco 350,000, '89 T-bird 300,000 miles without ever having come apart. Using Pennzoil 20/50, no additives oil, nor gas. God Bless America, Bill O|||||||O mailto:-------------------- http://www.----------.com/ DougW wrote: > > Normal?!! > 1 qt in 1000 miles would have a cloud following you down the road > and 4000 miles to engine seizure. > > I have over 132,000 Miles and have near zero oil loss between changes. > > That much oil loss indicates a problem. It may be as simple as > a clogged CCV tube or a leaking ring/valve seal. > > Checking the plugs will tell you if a cyl is burning oil > as the plug will be deeply covered or clogged with soot. > > Oil is known to leak from the rear of the I6 valve cover and > even the sides. |
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