--- "Robert E. Shlafer" <PilotRob@webtv.net> wrote:
> Fact:
> Synthetic oil, if used in "ventilated" rather
> than "closed loop" applications will slowly
> "disappear" from the crankcase...the stuff oxidizes
> in open air.
So does every single oil on the planet, dino or
synthetic. The higher the temperature, the worse the
problem, and it is much worse (like 2 or 3 orders of
magnitude) with dino oils than synthetics. Change
your oil before you put the car away for the
winter...the oxidation and the combustion byproducts
(NOx's) will eat away your bearings and metallic
surfaces. Synthetics are a blend of PAO
(polyalphaolefin). We use PAO in aircraft liquid
cooling systems, so without going into detail, it's a
great heat transfer agent. The only significant
drawbacks I found in months of immersion testing with
PAO is its incompatibility with non-metallic seals,
particularly nitrile, neoprene, ethylene propylene,
RTV Silicone, PVC tape, vinyl tape, and some others I
can't remember off the top of my head. The Total Base
Number is of significance here, and....nevermind, I
don't really want to break out my engineer chode at
the moment....
'Hopper
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