The Suzuki water buffalo ?I use a standard mineral oil in all my saws when not using Aspen, but I do also own a Suzuki GT750A. Not tried any decent synthetic oil in a saw with my own mix but I can say without doubt that the Suzuki runs a lot better on synthetic. But, as ever, quality is key. Don't buy the cheapest and I personally stick to brands that have a reputation to lose. Except Stihl. Their oil is surprisingly not very good--even their pre mix is a bit iffy.