Quote:
Originally Posted by bluesubie
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. |
yeah I know what the lower numbers stand for
but there are exceptions like you mentioned and not all the oils created equal , for instance Mobil 1 5w-30 Extended Performance is slightly thicker than the regular 5w-30 and offers slightly better protection..
I initially used 0w-40 Mobil 1 but when I switched to 5w-30 I noticed that the oil temps dropped a bit, many people experienced the same.. I think there is no right or wrong viscosity/oil but there is right use for the specific application