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Synthetic Oil for Lycomings

Posted: Fri May 21, 2010 3:38 pm
by CAPTAIN-D
I have always run Aeroshell 100 W 50 Wt in my engines.I was woundering if there is a synthetic oil for Lycomings?I know Moble 1 makes a synthetic oil for air cooled motorcycles everyone I talk to says it lowered ther temp when they switched over.Anyway what do you guys have to say.

Re: Synthetic Oil for Lycomings

Posted: Fri May 21, 2010 3:56 pm
by twister69z
Speaking only about Aeroshell 15W50 oil if you want a flat camshaft ,rust pitted lifters and pistons that resemble a loufa sponge then by all means use the oil .If however you want your camshaft remain in great shape and the pistons to last ,run Aeroshell or equivalent straight weight oil AD oil or Mineral oil. The pistons from using 15w50 oil coming into our overhaul shop, show rejectable amount of dis-similar corrosion in the piston pin area.and the camshafts (especially in Lycomings ) spall and pitt more than engines running on other AD oils.
My 2cents worth Twister69z

Re: Synthetic Oil for Lycomings

Posted: Fri May 21, 2010 5:03 pm
by jinotown
You can only use an aviation blend of mineral and synthetic if you run avgas. The 100 % synthetics will not disperse the lead compounds left over from combustion. Do not run anything but aviation oil or you will have a problem with deposits in the combustion chamber.

Re: Synthetic Oil for Lycomings

Posted: Fri May 21, 2010 6:07 pm
by R L Williams
Use aeroshell 100 W plus, has lycoming additive. :wink:

Re: Synthetic Oil for Lycomings

Posted: Sat May 22, 2010 11:08 am
by GMAC 76
i have been using the areoshell 15w50 semi syn for 5yrs in my 200 lyc with no problems except for the price per qt it has also been a good oil for my ol '75 shovelhead

Re: Synthetic Oil for Lycomings

Posted: Sat May 22, 2010 8:07 pm
by twister69z
At tear down is where most of the problems presented themselves.The only exceptions are engines flown with high usage , like in flight instruction or flying schools. I only present a mechanics view of the oils destructive nature on aircraft engines.
Twister69z