Quote:
Originally Posted by smbrm
0W?? oil is supposed to guarantee that the oil is thin enough to allow an engine to crank fast enough to start at -35 deg C and thin enough to properly pump at -40 degC.
5W-?? oil is supposed to guarantee that the oil is thin enough to allow an engine to crank fast enough at -30 deg C and thin enough to properly pump at -35 degC.
You want the oil to be thin enough to pump at 5 deg C lower than the oil being thin enough to allow the engine to crank fast enough to start to ensure that the oil gets to all the places its supposed to be!
Some may say it never gets that cold where I live! However the lower low temperature viscosity results in reduced oil drag in the engine, improves oil flow and reduces fuel consumption. Also increases power.
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I'm pretty sure that's the absolute minimum temperature your car is guaranteed to start. From what I understand, even summer temperatures are too low for the oil to flow well, and the majority of wear occurs on startup and when the engine is still cold, and that doesn't mean cold to the human body
