Re: Correct Trans and diff fluid for a YJ
 

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Jerry McG wrote:
>
> The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
> viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
> rating at average operating temp and is simply a rating based upon the
> effectiveness of its additives.
>
> Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
> "equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.
>
> Most wear and shifting problems occur when a unit is cold. Thus, because of
> it's superior flowing capabilities, a lighter oil is best under that
> condition. However, under higher temps and load a higher viscosity (90w) is
> better. To get the best of both worlds petroleum engineers start with a
> light weight base stock, then introduce additives that increase its
> capabilities under heat and pressure.
>
> The sulphur content of gear oils adds a complication: higher sulphur content
> (i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
> such as when it's squeezed between a ring and pinion. Unfortunately, that
> very advantage becomes a disadvantage re: synchronizer rings, which must
> have enough friction capability to stop spinning gears to avoid gear clash.
> High sulphur content oils compromise that function. Thus, engineers specify
> lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.
>
> This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
> straight 90w and it's easily apparent which is the lighter oil. You can also
> easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
> of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.

Re: Correct Trans and diff fluid for a YJ
 

Man oh man the old saying 'if you can't dazzle 'em with brilliance,
baffle 'em with BS' sure still holds true eh.

Mike

Jerry McG wrote:
>
> The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
> viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
> rating at average operating temp and is simply a rating based upon the
> effectiveness of its additives.
>
> Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
> "equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.
>
> Most wear and shifting problems occur when a unit is cold. Thus, because of
> it's superior flowing capabilities, a lighter oil is best under that
> condition. However, under higher temps and load a higher viscosity (90w) is
> better. To get the best of both worlds petroleum engineers start with a
> light weight base stock, then introduce additives that increase its
> capabilities under heat and pressure.
>
> The sulphur content of gear oils adds a complication: higher sulphur content
> (i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
> such as when it's squeezed between a ring and pinion. Unfortunately, that
> very advantage becomes a disadvantage re: synchronizer rings, which must
> have enough friction capability to stop spinning gears to avoid gear clash.
> High sulphur content oils compromise that function. Thus, engineers specify
> lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.
>
> This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
> straight 90w and it's easily apparent which is the lighter oil. You can also
> easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
> of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.
>
> "Jerry Bransford" <jerrypb@cox.net> wrote in message
> news:RWBOc.4856$Xn.1978@fed1read05...
> > Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
> > 75W is its' weight when cold... and the 'W' means Winter. Same with
> 70W-80,
> > it's an 80 weight when at its normal operating temperature and a 70 weight
> > when cold. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.cox.net/jerrypb/
> > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > news:ceeg6u0ga7@enews3.newsguy.com...
> > > > You are still confusing as ----. ;-) >
> > >
> > > I guess so, 'cuz we have no idea idf you're talking about me, Bransford
> or
> > > both of us.
> > >
> > > > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> > > supposed to be GL3 which redline doesn't make, but use redline because
> it
> > is
> > > better. <
> > >
> > > Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
> > 75
> > > weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> > > sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a
> 70w-80
> > > GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec
> for
> > > an AX5 or 15.
> > > >
> > > > Oh and 'don't use 90 weight because it won't shift, but meanwhile
> 'you'
> > > use MTL which 'is' 90 weight which is 'great stuff'.<
> > >
> > > Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
> > 75w-90,
> > > that is, a 75 weight oil.
> > >
> > > > So just what the heck is it?
> > >
> > > How many more times do we have to spell it out?
> > >
> > > > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
> > it
> > > doesn't have the limited slip additive for differentials.>
> > >
> > > Now we're getting somewhere, partiularly in an AX5 or 15.
> > >
> > > > 'I' could only find the GL4 diff fluid once when changing oil so used
> > it.
> > > My shifter stopped working shortly after.>
> > >
> > > Likely unrelated to the GL4.
> > >
> > > > 'I' then went and found tranny gear oil which only came in a semi
> > > synthetic at my local parts store, all the 'regular' gear oil had the
> > > limited slip or friction modifiers in, and now I have a sweet smooth
> > shift.<
> > >
> > > You don't have an AX15.
> > >
> > >
> > >
> >
> >

Re: Correct Trans and diff fluid for a YJ
 

Man oh man the old saying 'if you can't dazzle 'em with brilliance,
baffle 'em with BS' sure still holds true eh.

Mike

Jerry McG wrote:
>
> The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
> viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
> rating at average operating temp and is simply a rating based upon the
> effectiveness of its additives.
>
> Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
> "equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.
>
> Most wear and shifting problems occur when a unit is cold. Thus, because of
> it's superior flowing capabilities, a lighter oil is best under that
> condition. However, under higher temps and load a higher viscosity (90w) is
> better. To get the best of both worlds petroleum engineers start with a
> light weight base stock, then introduce additives that increase its
> capabilities under heat and pressure.
>
> The sulphur content of gear oils adds a complication: higher sulphur content
> (i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
> such as when it's squeezed between a ring and pinion. Unfortunately, that
> very advantage becomes a disadvantage re: synchronizer rings, which must
> have enough friction capability to stop spinning gears to avoid gear clash.
> High sulphur content oils compromise that function. Thus, engineers specify
> lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.
>
> This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
> straight 90w and it's easily apparent which is the lighter oil. You can also
> easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
> of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.
>
> "Jerry Bransford" <jerrypb@cox.net> wrote in message
> news:RWBOc.4856$Xn.1978@fed1read05...
> > Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
> > 75W is its' weight when cold... and the 'W' means Winter. Same with
> 70W-80,
> > it's an 80 weight when at its normal operating temperature and a 70 weight
> > when cold. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.cox.net/jerrypb/
> > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > news:ceeg6u0ga7@enews3.newsguy.com...
> > > > You are still confusing as ----. ;-) >
> > >
> > > I guess so, 'cuz we have no idea idf you're talking about me, Bransford
> or
> > > both of us.
> > >
> > > > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> > > supposed to be GL3 which redline doesn't make, but use redline because
> it
> > is
> > > better. <
> > >
> > > Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
> > 75
> > > weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> > > sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a
> 70w-80
> > > GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec
> for
> > > an AX5 or 15.
> > > >
> > > > Oh and 'don't use 90 weight because it won't shift, but meanwhile
> 'you'
> > > use MTL which 'is' 90 weight which is 'great stuff'.<
> > >
> > > Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
> > 75w-90,
> > > that is, a 75 weight oil.
> > >
> > > > So just what the heck is it?
> > >
> > > How many more times do we have to spell it out?
> > >
> > > > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
> > it
> > > doesn't have the limited slip additive for differentials.>
> > >
> > > Now we're getting somewhere, partiularly in an AX5 or 15.
> > >
> > > > 'I' could only find the GL4 diff fluid once when changing oil so used
> > it.
> > > My shifter stopped working shortly after.>
> > >
> > > Likely unrelated to the GL4.
> > >
> > > > 'I' then went and found tranny gear oil which only came in a semi
> > > synthetic at my local parts store, all the 'regular' gear oil had the
> > > limited slip or friction modifiers in, and now I have a sweet smooth
> > shift.<
> > >
> > > You don't have an AX15.
> > >
> > >
> > >
> >
> >

Re: Correct Trans and diff fluid for a YJ
 

Man oh man the old saying 'if you can't dazzle 'em with brilliance,
baffle 'em with BS' sure still holds true eh.

Mike

Jerry McG wrote:
>
> The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
> viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
> rating at average operating temp and is simply a rating based upon the
> effectiveness of its additives.
>
> Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
> "equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.
>
> Most wear and shifting problems occur when a unit is cold. Thus, because of
> it's superior flowing capabilities, a lighter oil is best under that
> condition. However, under higher temps and load a higher viscosity (90w) is
> better. To get the best of both worlds petroleum engineers start with a
> light weight base stock, then introduce additives that increase its
> capabilities under heat and pressure.
>
> The sulphur content of gear oils adds a complication: higher sulphur content
> (i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
> such as when it's squeezed between a ring and pinion. Unfortunately, that
> very advantage becomes a disadvantage re: synchronizer rings, which must
> have enough friction capability to stop spinning gears to avoid gear clash.
> High sulphur content oils compromise that function. Thus, engineers specify
> lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.
>
> This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
> straight 90w and it's easily apparent which is the lighter oil. You can also
> easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
> of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.
>
> "Jerry Bransford" <jerrypb@cox.net> wrote in message
> news:RWBOc.4856$Xn.1978@fed1read05...
> > Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
> > 75W is its' weight when cold... and the 'W' means Winter. Same with
> 70W-80,
> > it's an 80 weight when at its normal operating temperature and a 70 weight
> > when cold. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.cox.net/jerrypb/
> > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > news:ceeg6u0ga7@enews3.newsguy.com...
> > > > You are still confusing as ----. ;-) >
> > >
> > > I guess so, 'cuz we have no idea idf you're talking about me, Bransford
> or
> > > both of us.
> > >
> > > > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> > > supposed to be GL3 which redline doesn't make, but use redline because
> it
> > is
> > > better. <
> > >
> > > Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
> > 75
> > > weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> > > sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a
> 70w-80
> > > GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec
> for
> > > an AX5 or 15.
> > > >
> > > > Oh and 'don't use 90 weight because it won't shift, but meanwhile
> 'you'
> > > use MTL which 'is' 90 weight which is 'great stuff'.<
> > >
> > > Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
> > 75w-90,
> > > that is, a 75 weight oil.
> > >
> > > > So just what the heck is it?
> > >
> > > How many more times do we have to spell it out?
> > >
> > > > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
> > it
> > > doesn't have the limited slip additive for differentials.>
> > >
> > > Now we're getting somewhere, partiularly in an AX5 or 15.
> > >
> > > > 'I' could only find the GL4 diff fluid once when changing oil so used
> > it.
> > > My shifter stopped working shortly after.>
> > >
> > > Likely unrelated to the GL4.
> > >
> > > > 'I' then went and found tranny gear oil which only came in a semi
> > > synthetic at my local parts store, all the 'regular' gear oil had the
> > > limited slip or friction modifiers in, and now I have a sweet smooth
> > shift.<
> > >
> > > You don't have an AX15.
> > >
> > >
> > >
> >
> >

Re: Correct Trans and diff fluid for a YJ
 

Man oh man the old saying 'if you can't dazzle 'em with brilliance,
baffle 'em with BS' sure still holds true eh.

Mike

Jerry McG wrote:
>
> The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
> viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
> rating at average operating temp and is simply a rating based upon the
> effectiveness of its additives.
>
> Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
> "equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.
>
> Most wear and shifting problems occur when a unit is cold. Thus, because of
> it's superior flowing capabilities, a lighter oil is best under that
> condition. However, under higher temps and load a higher viscosity (90w) is
> better. To get the best of both worlds petroleum engineers start with a
> light weight base stock, then introduce additives that increase its
> capabilities under heat and pressure.
>
> The sulphur content of gear oils adds a complication: higher sulphur content
> (i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
> such as when it's squeezed between a ring and pinion. Unfortunately, that
> very advantage becomes a disadvantage re: synchronizer rings, which must
> have enough friction capability to stop spinning gears to avoid gear clash.
> High sulphur content oils compromise that function. Thus, engineers specify
> lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.
>
> This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
> straight 90w and it's easily apparent which is the lighter oil. You can also
> easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
> of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.
>
> "Jerry Bransford" <jerrypb@cox.net> wrote in message
> news:RWBOc.4856$Xn.1978@fed1read05...
> > Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
> > 75W is its' weight when cold... and the 'W' means Winter. Same with
> 70W-80,
> > it's an 80 weight when at its normal operating temperature and a 70 weight
> > when cold. :)
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.cox.net/jerrypb/
> > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > news:ceeg6u0ga7@enews3.newsguy.com...
> > > > You are still confusing as ----. ;-) >
> > >
> > > I guess so, 'cuz we have no idea idf you're talking about me, Bransford
> or
> > > both of us.
> > >
> > > > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> > > supposed to be GL3 which redline doesn't make, but use redline because
> it
> > is
> > > better. <
> > >
> > > Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
> > 75
> > > weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> > > sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a
> 70w-80
> > > GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec
> for
> > > an AX5 or 15.
> > > >
> > > > Oh and 'don't use 90 weight because it won't shift, but meanwhile
> 'you'
> > > use MTL which 'is' 90 weight which is 'great stuff'.<
> > >
> > > Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
> > 75w-90,
> > > that is, a 75 weight oil.
> > >
> > > > So just what the heck is it?
> > >
> > > How many more times do we have to spell it out?
> > >
> > > > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
> > it
> > > doesn't have the limited slip additive for differentials.>
> > >
> > > Now we're getting somewhere, partiularly in an AX5 or 15.
> > >
> > > > 'I' could only find the GL4 diff fluid once when changing oil so used
> > it.
> > > My shifter stopped working shortly after.>
> > >
> > > Likely unrelated to the GL4.
> > >
> > > > 'I' then went and found tranny gear oil which only came in a semi
> > > synthetic at my local parts store, all the 'regular' gear oil had the
> > > limited slip or friction modifiers in, and now I have a sweet smooth
> > shift.<
> > >
> > > You don't have an AX15.
> > >
> > >
> > >
> >
> >

Re: Correct Trans and diff fluid for a YJ
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:410E628D.C1E776CE@sympatico.ca...
> Man oh man the old saying 'if you can't dazzle 'em with brilliance,
> baffle 'em with BS' sure still holds true eh.>

Can't admit you're wrong, can you? ;-)

Re: Correct Trans and diff fluid for a YJ
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:410E628D.C1E776CE@sympatico.ca...
> Man oh man the old saying 'if you can't dazzle 'em with brilliance,
> baffle 'em with BS' sure still holds true eh.>

Can't admit you're wrong, can you? ;-)

Re: Correct Trans and diff fluid for a YJ
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:410E628D.C1E776CE@sympatico.ca...
> Man oh man the old saying 'if you can't dazzle 'em with brilliance,
> baffle 'em with BS' sure still holds true eh.>

Can't admit you're wrong, can you? ;-)

Re: Correct Trans and diff fluid for a YJ
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:410E628D.C1E776CE@sympatico.ca...
> Man oh man the old saying 'if you can't dazzle 'em with brilliance,
> baffle 'em with BS' sure still holds true eh.>

Can't admit you're wrong, can you? ;-)