Originally Posted By: Autodarken
Originally Posted By: OVERKILL
Originally Posted By: Autodarken
Originally Posted By: Clevy
M1 0w-40 should pump just fine even at -30c,so 32f isn't even testing the oil.
The W rating is @ 32f/0c, so you may want to double check on this statement. I found under 32f specs for 0w-40 Mobil 1 was drastically thicker than 5w-30's, 5w-20's and 0w-20's.
But the 0 in front of that W denotes a CCS viscosity of no higher than 6,200cP at -35C.
Then call Mobil and tell them they are all wrong:
M1 0w-20 MRV @ -40ºc, cP (ASTM D4684) = 9200
M1 0w-40 MRV @ -40ºC, cP (ASTM D4684) = 31,000
You aren't following this correctly
MRV and CCS are separate measures. Please look at the chart again. CCS for a 0w-xx is measured at -35C. MRV is measured at -40C.
The limit for MRV is 60,000cP. The limit for CCS is 6,200cP.
Both figures you just quoted are MRV, not CCS, and were measured at -40C, not -35C.
Mobil doesn't provide CCS figures for either of the oils you mentioned, however we know that they are 6,200cP or less as per the limits defined by the SAE.