The 05 Sienna is due for an OC and I have both these M1 oils in my stash. I originally bought the high mileage SL since I thought it was going away and thought the coming SM version was going to be dumbed down. Probably wrong on that assumption, but that was my mindset at the time. Anyway, I have seen the SN M1 0-30 UOAs and they seem to be looking good. Any thoughts on the SL High Mileage M1 5-30? Is it obsolete compared to the new Mobil SN's?
Edit: Current fill M1 HM 5-30
Last edited: