In a 2020 Toyota Corola 1.8L MPI engine I was using M1 0W20 EP for 5K miles / 1 year (which ever came first) . Currently the car is mainly driven in the suburbs with a high run a couple of times per month , so I figured I'd save a few $$ off of the jug price and "drop down" to PPPP 0W20 synthetic . Outside of the listed specs for both where M1 has a higher flash point than Pennzoil - what about oxidation and NOACK differences between the two 0W20 oils ?