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I change every 3000-3500 miles, and over that time oil consumption is not
discernable really.

Dave Milne, Scotland
'91 Grand Wagoneer, '99 TJ

"L0nD0t.$t0we11" <"L0nD0t.$t0we11"@ComcastDot.Net> wrote in message
news:6xDkc.1201$IG1.25773@attbi_s04...
> Roughly 4/30/04 13:20, Dave Milne's monkeys randomly typed:
>
> > Chaps,
> > Forgive me if I tread once again on the well worn territory of
oil
> > grades. I believe the consensus of group was that oils with a smaller
range
> > like 10w30 perform better than those with a larger range (e.g. 10w40 was
not
> > recommended). I think the reason given was that polymers were added to
> > alter the viscosity, and the larger the compromise, the worse the
> > performance.
> >
> > At the same time, Mobil One is highly recommended, and indeed is the
stuff
> > that the dealer would squirt in, were I incapable of unscrewing a
filter, a
> > cap and a drain plug.
> >
> > Except ... over here Mobil One is 5 w 40 ; that is a big ------ !
> > Thoughts ?
>
> It is attemting to apply a rule of thumb to one type of oil chemistry
> to an entirely different chemical formulation... The folklore for
> dinosaur urine is that the extended viscosity range is gained by
> adding a witches brew to a base stock derived from cracking crude oil.
> And that the components of this witches brew break down due to both
> time and load... lowering the effective viscosity range. Whereas the
> Mobil One synthetic is made from a different type of base stock [which
> may also come from dinosaur pee] of a different chemical composition
> entirely that needs less brewing to obtain a wide viscosity range,
> thus being a slightly less complicated witches brew so the different
> components will decay at a fairly uniform rate, so the viscosity
> stays stable over a longer service interval.
>
> On this side of the pond, oil viscosity is only measured at two
> temperature points... so at lower temps it may thicken quickly
> [or may not] and at higher temps it may thin non-linearily [or
> may not]...making viscosity range of limited usefulness in
> describing much of real interest about the oil.
>
> The synths tend to have better lube qualities at low temps and
> at high temps...with lower overall friction that stays a bit more
> constant over the service interval... and that alone may make it
> worth considering.
>
> I haven't noticed any odd results of cutting a 4.0 over to synth
> over 2.5 years... oil consumption is extremely low and I would guess
> a few percentage better oil mileage particularly on longer trips.
> ...and I still change it rather aggressively.
>
> --
> Evolution is merely survival of the minimally adequate
>

Roughly 4/30/04 21:20, Dave Milne's monkeys randomly typed:

> I change every 3000-3500 miles, and over that time oil consumption is not
> discernable really.

I used to burn about a half quart or less in that 3-4k mile change
interval, but then a miracle occurred. I finally got a round tuit
and changed the rear main seal and the valve cover plus gasket and
the consumption is now undetectable--go figure. Didn't really
notice any difference in leakage between the dino and drugstore
versions before finally fixing the leaks. Main benefit other than
slight increase in mileage appears to be a bit better holding of
oil pressure in triple digit desert temps and observably smoother
starting on frozen winter mornings in the mountains. Haven't
really changed the oil change interval much, as it gives a good
excuse to crawl underneath and look for other stuff.

--
Evolution is merely survival of the minimally adequate

Where did you get your round tuit? I have to do the same repair but
I've lost my round tuit.

L0nD0t.$t0we11 wrote:

> Roughly 4/30/04 21:20, Dave Milne's monkeys randomly typed:
>
>
>>I change every 3000-3500 miles, and over that time oil consumption is not
>>discernable really.
>
>
> I used to burn about a half quart or less in that 3-4k mile change
> interval, but then a miracle occurred. I finally got a round tuit
> and changed the rear main seal and the valve cover plus gasket and
> the consumption is now undetectable--go figure. Didn't really
> notice any difference in leakage between the dino and drugstore
> versions before finally fixing the leaks. Main benefit other than
> slight increase in mileage appears to be a bit better holding of
> oil pressure in triple digit desert temps and observably smoother
> starting on frozen winter mornings in the mountains. Haven't
> really changed the oil change interval much, as it gives a good
> excuse to crawl underneath and look for other stuff.
>
>

http://www.passco.com/tuit.htm :-)

Chris

"Jo" <jo_ratner@NOSPAMyahoo.com> wrote in message
news:LQWkc.1294$a47.373@newsread3.news.atl.earthli nk.net...
> Where did you get your round tuit? I have to do the same repair but
> I've lost my round tuit.
>
> L0nD0t.$t0we11 wrote:
>
> > Roughly 4/30/04 21:20, Dave Milne's monkeys randomly typed:
> >
> >
> >>I change every 3000-3500 miles, and over that time oil consumption is
not
> >>discernable really.
> >
> >
> > I used to burn about a half quart or less in that 3-4k mile change
> > interval, but then a miracle occurred. I finally got a round tuit
> > and changed the rear main seal and the valve cover plus gasket and
> > the consumption is now undetectable--go figure. Didn't really
> > notice any difference in leakage between the dino and drugstore
> > versions before finally fixing the leaks. Main benefit other than
> > slight increase in mileage appears to be a bit better holding of
> > oil pressure in triple digit desert temps and observably smoother
> > starting on frozen winter mornings in the mountains. Haven't
> > really changed the oil change interval much, as it gives a good
> > excuse to crawl underneath and look for other stuff.
> >
> >
>