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i use Mobil 1 Synthetic 10W30 Extended Performace, and replac a quart with Lucus Synthetic Oil Stabilizer, and use a Mobil 1 Filter. Ive used many oils, and this by far is the best. Ive taken a class on Mobil 1 oil, so iknow the benifits. This oil Cleans out the motor of sludge as well.
I generally run Mobil 1 10w-30 fully synthetic with 1 quart being the lucas oil stabilzer. Recently I have switched over to Valvoline high mileage synthetic blend 10w-40.