[EMAIL PROTECTED] wrote: > > forgot to send to list... > > --------------------------------------------------------------- > > Subject: Re: [COUPERS] oil > Date: Mon, 3 Jan 2000 21:04:35 EST > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED] > > Ken, > > I personally think there is little , if any difference.....I can't believe > that an oil that is suitable for an air cooled Porsch race car, turning > 6000+ rpm, would not be suitable for an aviation engine that is turning less > than 3000 RPM. > > The continental book doesn't proscribe any oil specifically other than 30 > weight, etc., and one meeting their minimum specs.......Seems like I can't > find the old Contionental book specs, tho... > > Newer engines seem to require high pressure contact oils......but auto > engines experience much more varied rpm and load ranges..... > > True, an a/C engine generally operated at ~75% power...cruise, while an auto > engine is operating at less that 50% power........ > > I am using 15W50 Shell semi-synthetic, hopping to reduce corroision from > inoperation, etc...But I do think that any good SAE Auto SE, SF , etc. oil > would be suitable.....except for if you do have a failure from anything else, > the insurance probably would not pay off..... > > I do think that if you find the Continental Specs, and meet them, then you > would be legal.... > > When these engines were originally certified, there was no A/C oil or > gasoline, I think. The engines were certified on 73 octane fuel.....and > non-detergent oils. > > Newer oils have not only detergents and dispersive agents ( keeps impurities > in suspension so they can be drained), but also extreme pressure agents such > as phosphorous, etc to act as extreme pressure additives....that prevent > scoring from dry engine start up and from high temperature lubrication > failure...or attempt to do so. > > The synthetics and semi synthetics provide better corrosion control and > better protection at high temperatures..... > > I still change the oil at ~ 25 hours....not depending on the better oil to > provide longer change periods......and I think it is worth the additional > cost. > > Fly Safe - Have Fun > > Harry Francis > 93530 > Blacksburg, VA.
Hi Harry,
I don't claim to be an expert, but I've been around engines all my
life
and there is an old saying, maybe you've heard it also, "Oil is Cheaper
Than Parts".
The car I drive will very soon be turning over half-a-million
miles on
it. I change my oil every 2,000 miles. Just watch the odometer and every
time it rolls over an 'even' number of thousands it's due a change.
What's a few bucks for oil and a filter (every other time) compared to
dependable service and long life?
Bob Saville
N3396H 415C
Eugene, OR
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