Originally Posted By: IndyFan
Ok, help me understand shear. What viscosity range did it shear to? Even if it shears to a 20wt, doesn't 20 wt protect well enough? Does M1 0w20 not shear like 0w30? I'm asking because I'm going with 0w20 for my Jeep when it comes due for a change in approximately the next month. I'm also considering M1 0w30 for my Soltice, which won't need a change until fall.
Heck, I might even run 0w30 in the van.
The fact that this oil sheared solidly into the 20wt range and that a 20wt oil may be still provide adequate protection is not really the issue because the end result is not the same as a 0W-20 or even a 5W-20 oil. The 0W-30 will still have a higher start-up viscosity than the 20wt oils even after all that shearing. If a 40C vis test was also done then we would know more precisely how the oils start-up viscosity is being affected.
I have not seen a UOA of M1's 0W-20 or 5W-20 that has sheared any more than 10% including the effect of fuel dilution. Consiquently the OP would be better off going with a 20wt oil in the first place.
Ok, help me understand shear. What viscosity range did it shear to? Even if it shears to a 20wt, doesn't 20 wt protect well enough? Does M1 0w20 not shear like 0w30? I'm asking because I'm going with 0w20 for my Jeep when it comes due for a change in approximately the next month. I'm also considering M1 0w30 for my Soltice, which won't need a change until fall.
Heck, I might even run 0w30 in the van.
The fact that this oil sheared solidly into the 20wt range and that a 20wt oil may be still provide adequate protection is not really the issue because the end result is not the same as a 0W-20 or even a 5W-20 oil. The 0W-30 will still have a higher start-up viscosity than the 20wt oils even after all that shearing. If a 40C vis test was also done then we would know more precisely how the oils start-up viscosity is being affected.
I have not seen a UOA of M1's 0W-20 or 5W-20 that has sheared any more than 10% including the effect of fuel dilution. Consiquently the OP would be better off going with a 20wt oil in the first place.