Originally Posted By: Johnny248
So, all things considered. If the M1 and PP are both on the shelf for ~$25, is one a better choice than the other?
Also, I am looking for an oil to use in two vehicles that both spec 5w20 from the factory, however I *think* I like the 0w option especially in the winter for improved fuel economy and quicker start up flow, however looking at the viscosity numbers, I'm not sure if there is much if any real world advantage to using a 0w20 vs 5w20? I'm still not an expert on how much of an actual difference a tenth or two makes between the different oils. The M1 oils, in 0w20 and 5w20 are very similar @40c in all three options, and are a bit higher than the PP. @100c the 0w20 M1 is closer to both of the PP oils, and all are lower than the M1 5w20 oils. So this would lead me to believe than the AFE, or either PP oils would a little more fuel efficient than the 5w20 M1's? That being said, would the higher @100c numbers possibly provider better protection for a harder working engine such as a truck??? Or am I just over thinking this entire process??
AFE0w20 M15w20 M1EP5w20 PP0w20 PP5w20
@40c 8.7 8.9 8.9 8.39 8.56
@100c 44.8 49.8 49.6 42.8 45.34
The correct M1 AFE KV40 is 45.8cSt (44.8 is a misprint).
The current PP 0W-20 spec's are KV40 46.8cSt, KV100 8.6cSt, VI 164.
AFE has a 173 VI and HTHSV of 2.7cP.
M1 5W-20 has a 160 VI and a HTHSV of 2.75cP.
MEP 5W-20 has a 161 VI and HTHSV of 2.75cP.
PP 5W-20 has a 169 VI and HTHSV of 2.6cP.
And for comparison TGMO 0W-20 has KV40 37.4cP, KV100 8.54cP, VI 216, HTHSV 2.6cP.
If both vehicles are spec'd for 5W-20 I'd recommend M1 AFE 0W-20 since it's actually intended for 5W-20 applications.
High temperature protection is determined by the HTHS viscosity spec' not KV100 and AFE has a higher than average HTHSV of 2.7cP so there really isn't any reason to consider one of the M1 5W-20 offerings.
Your could consider PP 5W-20 which is actually a bit lighter than AFE 0W-20 in your climate.