Larry this one doesn't apply to you because I know you are powered by an aircraft engine and therefore already know what oil should be used in = it. I've watched this oil thread and seen all the varying replies. Some have been close but others not so close. I worked for Shell for years and can state categorically that oil is oil, unless we get into synthetics. The = only difference is the additives that go or don't go into that oil. Oil = itself never wears out, it only gets dirty and loses it's additives. That is = why they now recycle oil. They run it thru screens layered with dyamacious = earth to clean it then put the additives back in and away it goes for another cycle of duty. Each and every builder will have their own preference to automotive engine oils and they will work out just fine as long as the following items are strictly adhered to. Changes and inspection are = thorough and frequent and you NEVER run aviation fuel. Why aviation fuel? Now we = get into the main reason, and there are several, why aviation engines run aviation oils. Aviation fuels have lead in it and therefore require additives to remove lead deposits from internal engine components, auto = fuel does not have lead. Second, aviation engines usually are subjected to extended sitting between use and therefore must have additives to = promote the oil staying on critical surfaces during these times. Thirdly, = aviation engines are subjected to very severe temperature changes in a very short period of time. Larry just proved that with his recent excursion. Say = it's 10 deg on the ramp, now figure out the OAT at 10,000 feet and don't = forget to add in the windchill. Now you get the idea. Yeh I know your oil temp doesn't vary much but that engine block temperature sure does. Anyone = that has a hard time with that one go stick your tongue on a steel fence post = at 10 degrees and get back to me. Lastly, the aforementioned temperature changes can and often do create condensation inside the engine after shutdown so the oil must have additives to disperse water from that condensation. Well that's it folks aviation oil versus auto oil. On a personal note, I ran 20w50 Valvoline in my racing Harley powered by = straight 100LL aviation fuel to know ill effect. BTW Harley Davidson engine oil = is in fact 20w50 Aeroshell. So now the choice is back where it began, up to = the individual builder and their particular operating environments and preferences. Doug Rupert Simcoe Ontario.
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