What type of oil for B&S 18 twin opposed in 917.255919. Detergent or Non-detergent? And does anyone know what the detergent is intended to do?
Tractor Supply carries regular SAE30 in a non-detergent. At least the one near me does. Dunno if that would help you guys at all or not. Might be a starting point though.The detergent does the exact same thing the detergent in your washing machine does - it keeps dirt suspended so it doesn't settle on things. Without detergent all the soot that blows by the rings ends up making sludge in the engine.
I think you'll have difficulty finding a non-detergent motor oil.
One of the reasons people avoid going to synthetic oil on older engines is it tends to have a lot of detergent. That can clean up the deposited sludge which may be sealing up deteriorating gaskets. Then the engine leaks.
I do not know what Briggs specified but where you live an automotive 10W40 should be fine year-round.
50/50 around here. Half the people say detergent, the other non-detergent. What keeps going through the gray matter is something read long ago about one, especially in a B&S, and can't recall which it was.Being in Florida I don't think you need a multi grade. Your engine doesn't have an oil filter. This is what I use, 30W Straight, Diesel blend