Was it Mobil One or a Shell synthetic that was being sold for Aero use? I
think it was Shell --- may be a moot point, because Mobil One was designed
and sold for automotive use only. However it was introduced when there was
still some lead in Motor fuel. Did it have problems then?
Is the problem that of the increased blow-by of aviation engines compared to
automotive engines?
Bill Schertz
KIS Cruiser #4045

I am not sure of the actual chemical reaction that occurs with the standard oil
(dinosaur juice) but full synthetics seem to be a more stable (thus less reactive
with lead) compound. If anyone wants to pursue this call Mobil's help line and ask
for an engineering answer.

I think that the vastly greater lead content in avgas and the looser fit in
air-cooled cylinders/pistons is the double whammy that caused the failures. So
make a 50/50  mix of Mobil 1 and a good normal oil. That should fix the problem
while giving better protection to each oil's weaknesses.

BTW I try (though it seems to slip, opps) to replace my oil at 5k intervals even
with Mobil1. Filtration with oil filters is not bad but not great either. At work
I routinely use ~1 micron filtration for specialized milling coolants, this is WAY
better than automotive/aircraft filtration.

Blake

 
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