It appears the viscosity of many of Mobil 1s oils have changed based on the provided viscosities on their website. For example high milage 5w30 used to be 11.7-11.9cp at 100C, but is now showing as 10.1cp.
I reached out for confirmation from Mobil 1 since this isn't an insignificant change, but got no response of value.
Anyways, now im looking for an oil recommendation for my 03 celica (1zzfe) with 190k miles. My oil pressure is fine (13psi max heat soak with ac and 55-60psi at 3krpm) with Mobil 1 5w30 HM EP, but I believe its the previous formulation with higher viscosity. I dont want to go lower with viscosity to maintain healthy pressure at idle.
I have a jug of 0w40 mobil1 fs for another vehicle, but am concerned it may be too thick at 12.9cp. Im looking to stay with Mobil 1 if ththere'a good fit since ive used Mobil 1 with the car for 88k miles. I need the oil to perform well at 100F and occasional periods down to -10F.