alannsr250 wrote:The 10 means the lowest optimum temp, W means winter, and 40 is the highest optimum temperature so if you live in a hot country then use a higher temperature oil and like wise for the winter.

Really? And there was me thinking that the number preceeding the W refered to the oils kinematic viscosity at 40*c, and the number proceeding refered to it at 100*c.

If anyone here can actually explain how the measurement of viscosity actually works and what the units are then please do.

Andy wrote:Eek! Does that mean next time I'm out and the temp drops below 10 degrees I have to walk home?!

Yes mate, but I'll leave you to wonder whether it's 10 degrees fahrenheit, celsius, kelvin or whatever.
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