At 04:30 PM 7/21/2016, you wrote:
>Thanks for that great summary Jeff.  I've been tossing up on running 
>automotive oil in my O-200 (which only ever sees 100LL if I'm away 
>somewhere and it's too hard to get unleaded) but had decided the 
>saving between a good automotive oil and aviation oil is practically 
>nil so I've stuck with aviation oil.  Looks like the science backs 
>that decision.  Good to know. Cheers, Tony
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

I know nothing about the science of oils other than it is slippery 
and makes a mess if you get it on your hands, floor, or anywhere 
else.  I can however share 1000 hours of experience with two 
different engines.  The Tripacer had right at 1800 hours (0-320) 
since overhaul and I flew it an additional 500 hours and it flew an 
additional 100 to 200 hours after I sold it before it was 
overhauled.  The 0-200 in my KR had 1800 hours on it when I purchased 
it, it sat for nearly 10 years, and I've put 550 hours on it.  I've 
probably run 50 / 50 100LL and non-alcohol auto fuel at different 
times over those hours.  I've used exclusively Phillips 20W50XC and 
I've also used Marvel Mystery oil consistently over that 
period.  1000 hours on high time engines and never a stuck valve and 
the plugs rarely have any carbon build up.  I've only had to replace 
one high time cylinder as it had an intake valve seat deforming and 
would only hold 40 pounds of pressure.  It was still being flown 
regular when I found the problem on an annual.  I put 1 to 2 pints of 
MMO directly in the crankcase at oil change time and 4 oz in the fuel 
for each 10 gallon.  I have no way to prove that MMO is beneficial 
but I'm not about to stop using it.  I also knock on wood, cross my 
fingers, and tap the dash 3 times before pulling the starter T 
handle.  Unless there are considerably different metals used in VW 
and Corvairs I'd be inclined to treat them as air cooled aircraft 
engines as they have the same running parameters.

As always........

Larry Flesner 


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