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Shell is conservative in the amount and type of synthetic to protect
themselves against unintended $$ consequences... Their good oil can be
improved, the engineer types tell me...

The "problem" with AV-1 was initially found in turbocharged engines, flown
routinely at the highest altitudes with the oil and cylinder temps near the
red line... These operators were also following the 300 hour oil change that
Mobil was touting (dumb, dumb, dumb! as a marketing edge to offset the
higher cost of the oil) which allowed the oil to become super saturated with
lead salts.. The chilled portions of the engine, such as the crank snout
exposed to air at 20,000 feet, etc., condensed the lead out of suspension,
both plating it onto the inside of the chilled metal, and allowing it to
form larger grains that circulated and settled out elsewhere ...

I was the distributor for the midwest for Belray AERO-1, which we considered
to be superior to AV-1, for a number of reasons... This part time, weekend
business was going to be nutured and developed and was intended to become my
retirement income...
I might add that I have some hard feelings towards the marketing folks at
Mobil who scuttled that in one swell foop...

Denny




"don ferrario" wrote in message
news:myR56.9359$fC1.80917@nnrp1.ptd.net...
> Im not an oil engineer, so help me out on this...
>
> I thought that the current Aeroshell 15W50 was already a semi-synthetic
> that is part synthetic and part petroleum base, thereby accomplishing
> exactly what "some engineer types" are doing below.
>
> Is my understanding of Aeroshell 15W50 correct?
>
> I have always been a big fan of synthetics. I use Mobil-1 in everything
> I own (except the airplane, of course, since it isnt made anymore). Even
> have it in my lawn mower.
>
> I had AV-1 in my Lycoming IO-540 (non-turbo) for about
> 300 hours, until AV-1 was withdrawn from the market. From the
> reports I read at the time, the lead problems were primarily with
> Continental engines. Was that true?
>
> don ferrario
> Lance N54SS
>
>
>
> "k8do" wrote in message
> news:#RGqM4ydAHA.271@cpmsnbbsa07...
> > Not that I would ever do this, but: Some engineer types I know are
> mixing
> > Aeroshell 15W50 with Mobil One 15W50 synthetic... The aeroshell supplies
> the
> > tricresyl phosphate for the lycoming valve guides, and the ashless
> > dispersant, and the additional synthetic stock greatly increases the
> > adhesion of the oil to the cylinder wall and raises the coking
> temperature,
> > which reduces oil burn... There is a significant increase in running
hours
> > per quart of oil... The oil pressure comes up immediately, even on a
> below
> > zero start.. .
> >
>
>

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