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Guys (and girls too), Here's the situation: a friend and I are building a Vans RV-7A, we plan on installing a diesel engine in this aircraft and we're looking for the best oil we can get for this application. Our objectives are reliability and long life first then fuel consumption. This...

Hi all, Friend of mine is adding some synthetic gear oil (75w140) to his regular motor oil at each oil change and he says the extra protection from the gear oil is helping his engine too. Now I'm not an oil specialist but I think he's wrong about this. what do the specialists on the forum...