Just for grins, I tried Amsoil and sent a sample in to Blackstone. Got the results today. The good news is that the oil held up after 11 hours. The bad news was it was high in silicon. Doing a little research and found out silicon sort of equals silica which equals SAND! Pulled the air filter and found dust in the intake! Arrrgh Going to go back to my old habit of using grease on the box/filter connection. Hope that works.