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  #1  
Old 08-25-2012, 08:48 PM
TXFlyGuy TXFlyGuy is offline
 
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Default Mobil One, Anyone?

With an auto conversion powered airplane, is there any reason not to use a good synthetic oil? Are synthetics compatible with 100 LL? If not, why not?
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  #2  
Old 08-25-2012, 08:54 PM
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hevansrv7a hevansrv7a is offline
 
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Default Don't

Quote:
Originally Posted by TXFlyGuy View Post
With an auto conversion powered airplane, is there any reason not to use a good synthetic oil? Are synthetics compatible with 100 LL? If not, why not?


My understanding, not personal knowledge, was that Mobil-1 aviation oil was taken off the market because it did not properly "scavenge the lead" in 100LL. It was used in the Voyager world flight, but later discontinued.

For car gas you have a different set of issues, of course.
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  #3  
Old 08-25-2012, 08:57 PM
TXFlyGuy TXFlyGuy is offline
 
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Default

What about Aeroshell's synthetic blend 15-50 oil?
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  #4  
Old 08-25-2012, 09:44 PM
dlomheim dlomheim is offline
 
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Default Mobil One and "alternative" engines

From all I have read over the years the synthetics didn't work reall well in aircraft engines due to the greater amount of blow by associated with the looser clearance of rings on an aircooled engine, etc. Many of my rotary buddies (Mazda 13/20B engines) run Mobile one and 100LL or 87 octane car fuel without any issues and that is what I will use in my 13B when I get it flying...

Doug Lomheim
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  #5  
Old 08-26-2012, 08:34 AM
chaskuss chaskuss is offline
 
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Default

Quote:
Originally Posted by TXFlyGuy View Post
What about Aeroshell's synthetic blend 15-50 oil?
Myron,
This would be a much better choice, if 100 LL will be used. It has the correct "ash-less dispersant" additive package.
Charlie
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  #6  
Old 08-26-2012, 08:45 AM
TXFlyGuy TXFlyGuy is offline
 
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Quote:
Originally Posted by chaskuss View Post
Myron,
This would be a much better choice, if 100 LL will be used. It has the correct "ash-less dispersant" additive package.
Charlie
Thank you, Charlie!
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  #7  
Old 08-26-2012, 09:13 AM
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rocketbob rocketbob is offline
 
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You could run Mobil 1 if you take care of the ring and piston clearances. When was the last time you've seen a gasoline car engine oil turn black?
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  #8  
Old 08-25-2012, 09:58 PM
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RV6_flyer RV6_flyer is offline
 
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Quote:
Originally Posted by TXFlyGuy View Post
With an auto conversion powered airplane, is there any reason not to use a good synthetic oil? Are synthetics compatible with 100 LL? If not, why not?
Anyone that has been around aviation a while would not use a 100% synthetic oil in an engine that uses 100LL if you gave them the oil free. Too many engines were destroyed by Mobil 1 aviation oil when it was on the market. The synthetic oil does not handle the lead well and the sludge that formed destroyed the engines.
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  #9  
Old 08-26-2012, 08:04 AM
gipsowh gipsowh is offline
 
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Default Do NOT use synthetics

Bud Warren told me to never never use synthetics with 100LL. The lead will turn it to a gray sludge and destroy your engine. Use SAE 30W or 5w-30 and keep it clean. Period.
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  #10  
Old 08-26-2012, 08:25 AM
TXFlyGuy TXFlyGuy is offline
 
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Quote:
Originally Posted by gipsowh View Post
Bud Warren told me to never never use synthetics with 100LL. The lead will turn it to a gray sludge and destroy your engine. Use SAE 30W or 5w-30 and keep it clean. Period.
So the primary fuel in use will be 93 octane mogas. And the engine most likely will be a Chevy. Considering that on occasion we might be limited to 100LL, what oil would be best suited for this application. And what about Aeroshell 15-50 synthetic blend?
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