Originally Posted by wstar

As for the rest of it, re: specifics on what it takes to damage our engine life, and by how much, we're never going to get that data. We'd need someone independent (ourselves?) to pony up several VQ37VHRs and put them on test stands in rigorous testing conditions and destroy them (and figure out the exact relationships between things like X RPMs sustained for Y seconds = Z degrees increase in oil temps). Some people in the bowels of Nissan already have this data, but as usual they don't feel like sharing.

So we do what we can with the standard things we already know about oils and engines, which leads one to believe that even without hitting limp mode at 280, sustaining 240-260-range oil temps all the time is worse for the oil and the engine wear than keeping the temps lower, and it's not hard to fix with an oil cooler.