Originally Posted By: lexus114
Another thing,My factory oil sheared down like water. And was all grey! I have GC in it now,and its getting grey again. Still breaking in I suppose.
There's a user here - benjamming - who did several UOAs on his Toro with the same B&S engine. He used the factory oil a few times, then switched to Amsoil 10w-30, and then his engine suffered a catastrophic failure. It was determined to be a result of a manufacturing defect, not oil-related.
Anyway, he also mentioned that the oil becomes grey. I think it's just the fact that these engines have no oil filters that makes it harder on the oil.