Quote:
Originally Posted by 101Volts
I'm surprised nobody mentioned this: Not all 0w30s, 5w30s and 10w30s are the exact same viscosity, the numbers represent viscosity ranges. Pennzoil Platinum 5w30 is thinner when hot and cold than Mobil 1 0w30, you have to compare oil data sheets which are public to know things like this.
M1 0w30:
Viscosity @ 100ºC, cSt (ASTM D445) 10.9
Viscosity, @ 40ºC, cSt (ASTM D445) 62.9
PP 5w30:
Viscosity @ 100ºC, cSt (ASTM D445) 10.3
Viscosity, @ 40ºC, cSt (ASTM D445) 56.9
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You're confusing the "warm" viscosity (40°C = 104°F) measure with the actual "cold" viscosity used to determine the first number in the viscosity rating. The 0W or 5W or 10W is measured at -30°C or below.
