Originally Posted By: gryffinwings
Originally Posted By: A_Harman
Originally Posted By: gryffinwings
Originally Posted By: Dyusik
M1 is thinner with the same HTHS, reduced consumption... I'm willing to bet you will return to it if you try anything different for one reason or another.
Yeah it's bizarre, I went from the thicker oil to a thinner oil and I get less consumption even at higher RPM, with Valvoline Maxlife 10w40, I was getting a decent amount of smoke at start up, but I'm not getting that with the Mobil 1 High Mileage 10w30, I wonder if the Valvoline Maxlife 10w40 is more volatile.
Anyways the only reason I would change is because I'd be changing to a higher performance engine DOHC 1.6 liter engine D16A1 which will be built fresh. What I might do for oil is use Mobil 1 FS 0w40, similar cSt specs to High Mileage 10w30 and better HTHS at 3.8. Anyways I won't know how the oil works until I do the build and run the oil. I've started to use cSt as a basis for comparing oil weights, since oil weights seem to have a range that they sit in.
My opinion is you should stick with the M1 10w30 HM for your current engine.
The FS 0w40 would be nearly indistinguishable from it, because the HTHS dropped from 3.8 to 3.6 when they created the FS version.
I could swear I was reading 3.8 on the Mobil 1 website a couple of days ago.
Nope, I just checked the Mobil site, and it's 3.6.