I've got about an hour of running time on the motor, and the oil I just put in looks like sludge, kind of a brown and dark gray mix. I'm figuring that it's probably picking up all the sludge from the past 20 years of sitting. Should I do several oil changes on a short interval until the oil stays fairly clean? What weight oil do you guys run in your motors? I have 10w30 in mine right now. Thanks!
