Originally Posted By: Virtus_Probi
Originally Posted By: newbe46
Originally Posted By: aquariuscsm
I just can't wrap my head around ever needing a 0W anything unless you live in the middle of Antarctica on the East Antarctic Plateau. The 0W is coming out of my Honda next oil change and being replaced with 5W20.
The 0W in 0W-XX refers to the viscosity when the oil is NOT at the operating temperature while the XX is the viscosity when oil is at the operating temperature. No?
SAE Viscosity Grade
Low-Temperature ( ˚C) Cranking Viscosity (3), mPa-s Max Low-Temperature (˚C) Pumping Viscosity (4), mPa-s Max with No Yield Stress (4)
0W 6200 at -35C 60000 at -40C
5W 6600 at -30C 60000 at -35C
10W 7000 at -25C 60000 at -30C
15W 7000 at -20C 60000 at -25C
20W 9500 at -15C 60000 at -20C
25W 13000 at -10C 60000 at -15C
Sorry, this isn't coming out right...CCS on the left and MRV on the right. I'll try to figure out how to copy the table later.
So does that mean if the viscosity at operating temperature is the one we worry about, a higher weight oil such as 0W-30 or 0W-40 should be used?
My understanding is that most of the engine wear comes from startup when oil flow is at the lowest, unless of course the engine is operating in track condition most of the time. We should aim for better flow at low temp but maintain viscosity at high temp?
Originally Posted By: newbe46
Originally Posted By: aquariuscsm
I just can't wrap my head around ever needing a 0W anything unless you live in the middle of Antarctica on the East Antarctic Plateau. The 0W is coming out of my Honda next oil change and being replaced with 5W20.
The 0W in 0W-XX refers to the viscosity when the oil is NOT at the operating temperature while the XX is the viscosity when oil is at the operating temperature. No?
SAE Viscosity Grade
Low-Temperature ( ˚C) Cranking Viscosity (3), mPa-s Max Low-Temperature (˚C) Pumping Viscosity (4), mPa-s Max with No Yield Stress (4)
0W 6200 at -35C 60000 at -40C
5W 6600 at -30C 60000 at -35C
10W 7000 at -25C 60000 at -30C
15W 7000 at -20C 60000 at -25C
20W 9500 at -15C 60000 at -20C
25W 13000 at -10C 60000 at -15C
Sorry, this isn't coming out right...CCS on the left and MRV on the right. I'll try to figure out how to copy the table later.
So does that mean if the viscosity at operating temperature is the one we worry about, a higher weight oil such as 0W-30 or 0W-40 should be used?
My understanding is that most of the engine wear comes from startup when oil flow is at the lowest, unless of course the engine is operating in track condition most of the time. We should aim for better flow at low temp but maintain viscosity at high temp?