stol wrote:
Clay wrote:

Is anyone using Royal Purple Synthetic Oil in their aircraft engine?

If so, how do you like it? Are the temps down? How far between oil
changes? What engine are you usine it in?



I started my new motor out on Valvolibe 40# racing oil and at 30 hours
switched to Amzoil 40#. After less then 10 hours the distributor drive
gear destroyed itself. I called Amzoil and the tech there admitted the
poor high load carrying capacity their synthetic oils have has caused
that same failure in lots of engines. I am back on Valvoline and all is
running well. For what is is worth the syn oil did run about 15 degrees
cooler then the petroleum oil does.

I've never heard of Amzoil. Is it anything like Amsoil? I'm surprised
they would admit any such deficiency given their past marketing
practices. They hype the four ball test constantly and that is supposed
to be a measurement of film strength.


Matt