Doug , Amsoil and Mobil are both out of the pure synthetic aircraft oil business ... They both still make good oil for cars... As far as I know the best we can do is Shell with their parasynthetic oil... It is part synthetic, it's the one in the black bottle with the higher price tag... Mobil got in trouble with theirs with Continental because of the extended drain time, just wasn't doing the job in some cases... Amsoil said they quit because of the liability not because of the product... All you said about synthetic oil is correct and it is a shame that we are at the place that car oil is better than aircraft oil for our little jewels... I am sure that approved 100% synthetic will be back someday.. If you do find learn any news of anything being approved please pass it along... I would like to use it... I had better make a note to say that I am NOT using car oil in my airplanes or someone will read that into it... Wv Jim Palmer 415C N99906 M10 N9513V ------l--0--l------ From: Doug Davis <[EMAIL PROTECTED]>
>Has anyone on the list experimented with synthetics to lower oil temp? I >understand that some are approved, including Amsoil. Pure synthetics have >no crude oil base or paraffin, to crystallize behind your rings when temps >go the the 200 degree mark. They reduce and in some cases nearly eliminate >friction (heat). Plus the way most of us fly, the aircraft can sit for long >periods of time without the need of an oil change, or "pickling". Up to >one year without a "dry start". I've tried it in the family car and in our >"greyhound" type bus motorhome conversion, with astounding results. 25% >increase in power and fuel mileage, and have just changed the oil ( the >first in three years and 30 thousand miles). My oil analysis still showed a >TBN rating of over 13 points,( thats the lubricity rating) My former >ratings on the petroleum products were at the 4-5 point level after 5000, >miles. I really didn't have to change, according to the reports, but I '' >chickened out". The only problem I have, is that in the fall and winter my >engines run too cool for proper combustion,critical in a diesel. Aircraft >turbines cannot run without synthetics. Should tell us something--eh? >Doug >P.S. you've got me thinking. I'm calling Amsoill in the morning to see what >they say. >
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