15W will be fine for the Chonda - Honda recommends the 10W- stuff as a 'universal' oil, that includes operation in much lower temperature conditions than encountered in Oz. 15W40 would be a good choice.

This is the oil viscosity chart from the GXV120 workshop manual:
[Linked Image]

Briggs side-valves on the other hand [assuming this is for your Quantum] are best suited to an SAE30 monograde oil. They always seem to burn a bit of oil when run on multigrades, even 20W50.

However, 15W40 will work fine; just need to keep an eye on the level.


Cheers,
Gadge

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