Quote:
Originally Posted by Bumbo
When it comes to the engine, higher speeds to me means higher RPMs.
Perhaps you re-geared your truck, and hit a max speed of 75 MPH at 4000 PRM, maybe then I would start to concern myself. Or if you have a dramatically increase standard load, as in you tow heavy things regularly, at lower gears, which also increases RPM.
I would just follow the standard weights based on what you are saying here. Its rare that most of us here would be operating outside of a condition of the service manual.
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100% correct! Way too many folks overthink motor oil. The engineers at Toyota designed the engine to handle a huge range of speed and loads. Remember they are the ones who have to warranty the engine if something happens to let go inside. Toyota says 0W-20, that's what i'm using, especially as long as I am in warranty.
Given modern CNC machining tolerances, just how close are the clearances between the crank and the bearings? just how thick (heavier) can you go before the oil pump cant push the oil to the bearings fast enough? I dont know...do you? This is not a subject I want to argue with the Toyota folks over is there is a warranty issue....
FWIW, Both Mercedes we have owned ran 0W-40 Mobil 1. One is a 330 HP 8000 RPM 3.5 V6. The other was a 5.5l twin turbo V12 producing 525 hp/630ft lb. Both engines run as smooth as a turbine engine..never an issue with oil.
Personaly, I'm not worried about the "0w-20" rating, and cant think of a situation where I would need to consider a heavier oil.