Originally Posted by Doublehaul
10k oci M1 0w40
Fram ultra every other change
UOAs to prove it works lol
40wt oil is speced for this engine all over the world and the full saps Mobil (and Castrol) products are on the brink of being 30s anyways. Hugely strong add packs and TBN and they both meet the strictest oil specs on the planet.
Want clean pistons, low cam and bearing wear? See my sig
Ok. Good to know! Has using 0w40 impact your MPG at all? I know these vehicles aren't exactly known for it, but I'm just curious. Since you're a stout Toyota driver, any reason why you use 0w40 instead of 0w20 or 5w30?
Originally Posted by Bryanccfshr
true..the problem is that the audience does not have the vocabulary and understanding of the technical aspects to know that 0w40 is just not that much thicker than 0w20. They are all in the range of "engine oil" which is a narrow range in itself.
Originally Posted by Y_K
Originally Posted by BucDan
Going from 0W20 to 0W40 seems like a pretty big jump.
Correlation between oil 'weight' and oil viscosity is not linear. And correlation between kinematic viscosity and oil film thickness is not linear as well.
I'll be honest, I don't have a very deep understanding of the oils and weight, that's why I'm here
. All I know is what the factory fill weights are for my cars, and I just stick to it. I know they recommend and allow other weights, but I've kinda fallen into the "routine and commonality" system that I don't stray from because I don't know much about it and combine what I read in forums, what the manual says, and what they use for maintenance at a dealership. Like for my Audi, it's 5w40 Motul, else it's 0w40 from Castrol. I know I can use 5w30, but for some reason I'm afraid(?) to use it when it is also recommended; yet the VAG community loves that oil weight as a unicorn for some reason.