Originally Posted by Gadge
As far as 4-stroke mower oils go, the main reason for using SAE30 mono-grade in side valve engines [older Briggs etc] is just to minimise oil consumption. Multi-grade oils are fine from the lubrication perspective, but in Oz, go for one with at least a SAE20 cold viscosity [i.e. 20Wxx].
Hi Gadge,
do you mean pick 20W XX if you must use it for two strokes, or did you mean for the side valve four?

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!