some random thoughts- not necessarily facts:Someone please educate me. After months of research, I still don't understand oil weight and viscosity.
My main question is if 0W-20 and 5W-20 perform the same at operating temperature and most engine wear occurs at startup, why use 5W?
- If you drive hard, most wear occurs at WOT/ mid- high rpm and load
- I can think of only one ILSAC 0W30, there are more 0W20 due to CAFE
- Initially Asian 0W20 (Idemitsu/ Subaru) typically were at the low end of the KV100/KV40 vs Dept Store offerings
e.g: Current VW508 from MOTUL is PDS reads 38 / 7.8 mm2/s for KV40/100
- Most live in a climate that would never require a 0W rating