Engine Oil for the S2000

[VeYzZii]

The W does stand for winter and the number before it is the viscosity at -18 degrees Celcius. Therefore it is totally irrelevant to us in Australia. Only the second number is important.

Your right AUS, but viscosity VS temp is linear.. So it might not matter what it is at -18 deg Celcius, but it does matter at lets say 10 - 15 degrees (normal morning in Australia). So if viscosity of W is lets say 5 for oil X and 10 for oil Y but both oils have the same high temp viscosity, wouldnt there be a difference in the oil viscosity on start up??