for those looking for his oil change interval, i asked his answer is below, but short answer is roughly 200 hours between changes
"Changing the oil by the book (which I couldn’t locate just now, for whatever reason) would have broken our piggy bank in a heartbeat, since for years we ran this generator model for up to 21 hours per day, day in, day out. With Slick 50 helping out, I got away with changing the oil no more than once every 10 days or so, or somewhere in the 200 hour range. NOBODY would recommend that, though, and I’m not recommending it, either. Also, I no longer use Slick 50 in small engines until they’re well broken in (at least), because if I do, the rings never seat and the machine ends up using a lot of oil over time."
