2021 Rav 4 XLE gas engine
Can you state what the main and rod bearing clearances are for the 5th gen RAV4 Dynamic Force 2.5 liter engine and then tell us the clearances on the 1st,2nd, 3d, and 4th generation Rav4 engines so that we can all see that you are correct--ie, that our Dynamic Force engines have tighter tolerances.If YOU would read the engineering documents coming out of Toyota Japan, and many other makes, you will find that in the past 15+ years, they ALL have trended toward designing engines with (a) finer tolerances, and (b) the need of those engines to use thinner oils, for BEST protection.
This is why ALL makes back-spec thinner oils for SOME of their legacy motors, but not all.
This is why putting 0w-16 in a 1960's vintage engine or any of those from the 1970s would greatly shorten their life because they were designed with WIDER tolerances, which demand thicker oils.
It's about thinner tolerances, and your refusal to face facts. You also refuse to look at Used Oil Analysis, thousands of them that prove thinner oils do in fact protect today's latest engines.
Thin oils will screw up engines that have wider tolerances like those most engines pre 2000's. And thinner oils like 0w-16 will INCREASE the life of the latest engines for 2021.
I would suggest you lean not unto your own understanding, and instead go with science, the experts at Toyota engineering, and facts: UOA's. You change your oil at 5,000 miles out of zero evidence to do so. What you do not understand is that oil loses its additive package protection LONG BEFORE it's viscosity is thinned to the point of being too thin.