The penrite 30 is bery good oil and is all I have used on any briggs engine for years, good value for money too, generally a 5l bottle is less than $40, the briggs and stratton branded oil found in mower shops im dubuous of, sure it might be okay, but I have been told it is recycled oil, funnily enough the seal on the bottle is the same as the home brand car oil at woolworths, which I have confirmed to be re-refined oil.
