Mobil1 0w-40 vs 10w-30 Viscosity

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2,569
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College Dorm...
Looking at the spec. sheets, I just realized something. At 40C: 0w-40 has a viscosity of 80cSt. 10w-30 has a viscosity of 62cSt. How is this possible...shouldn't 0w-40 be thinner at 40C than 10w-30? What am I missing here?
 
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4,798
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Lakeville, MN
Even simpler - the 5w and the 0w have NOTHING to do with the viscosity at 40 C. The 5w must pass a cold crank simulator test at -30 C and a pumping test at -35 C. The 0w must pass a cold crank simulator test at -35 C and a pumping test at -40 C (Standards set up in the J300 testing protocol). At some point, the lines on the viscosity/temp graph will cross, but it will generally be well below 40 C where this happens. [ September 24, 2003, 06:16 PM: Message edited by: MNgopher ]
 
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