Quote:
Originally Posted by glamcem
FYI, I have been using 5w-30 not 0w-30 since it gives more protection at higher temps
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The only difference between a 0W-30 and a 5W-30 is that the 0W is tested at -35C and the 5W is tested at -30C.
http://www.pqiamerica.com/coldcrank.htm
The second number is actually a viscosity range. You can have thin xW-30's (anything that meets GF5 specs) and thick wX-30's (anything that meets Euro specs or a race oil).
A Euro 0W-30 will be thicker at operating temp., have a higher High Temp High Shear, and likely have higher oil pressure than a GF5 5W-30.