ORIGINAL: w8ye
Best thing is not to get in the Amsoil trap in the first place.
Saw a friend fall for Amsoil - and then running it richer 80:1 - and then all the black goo - and then he changed to Redline at 50:1 - and he's now happy.
Has taken all flying season for the black to work its way out of the engine/muffler.
I`m in an obstinate mood today, so please make allowances.
New gas engines customarily spit black oil for a while, then magically, it clears up. This happens regardless of the brand of oil being used.
There was a time when 100:1 Amsoil was the hi-tech leader in synthetic oils mixed at less than 32:1. Sadly that might have been a while ago.
Most of the complaints that I have read/heard have been from commercial users. When you consider that our model engines seldom approach the use in hours that a homeowner places upon their utility engines, I think it likely that the average flyer will be happy with the performance that Amsoil provides.
Ed Cregger