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Originally Posted by prandelia
Toyota Motorsport Germany disagrees.
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Disagree with *what* of the above, exactly? For cars built and used exactly *how*?
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They started with 10W60 but then just recently moved to 5W50.
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For 95/5 street/track? Or for track only? What weight oil to use is another question in addition to whether or not to run an oil cooler btw...
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They also know the inherent oil pressure issues with the block design, and how one port has to cover two journals, and there is no bearing priority oiling in this system. So the only reasonable way to help offset those glaring issues, is by controlling temps and viscosities/weights, which go hand in hand.
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An oil cooler isn't going to magically fix inadequate oil supply. This is not why they run one for their car, whatever it is.
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If you think for one second you are "harming" your engine more by running 5w40 or 5w50 for tracking days and leaving it in, instead of using 0W20 or 5W30, then I'm not sure you will ever understand.
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What weight oil to run is a different question. For my usage, I'm not too worried about running 5w30... I wouldn't have any particular qualms about running 5w40 for my usage either but also don't see a need to.
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The wear that happens on a track in those "short" 20 minute sessions under high load are WAY more than thousands of commuter miles, or "hard" street miles.
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Yet people have had oil analysis done without discovering inordinate amounts of wear metals in even thinner oils run at the track...
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I also trust data. Here is my actual real life on-track data. 66F day, at Gingerman. Full race car on hoosiers, turning 1:41 laps, which means the car is getting wailed on harder than any street car is.
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You're pulling a few/several tenths more g's in corners than a "street" car on street tires would, so there's that, but as far as the amount of time at full throttle at or near max rpm, it's not going to be hugely more than a street car on "street" RE71Rs or similar. But anyway yeah, different cars built for different overall usages may have different requirements.
Regarding your plots, I see four squiggly blue lines ,none of which looks like oil pressure or temperature and a scale for speed which goes up to 320mph. This screen shot is telling me barely more than jack...
Dunno why 212F oil temperature should be considered "perfect"...
Switching to thicker oil "simply for oil pressure increase"? Although "oil pressure is decent"?
Regarding "see the big pressure drops", no not really because the scale I see doesn't tell me what range of oil pressures I'm looking at.
But if the question is whether or not to run a cooler for HPDE/street usage (and it is), none of what you have provided answers that.
You run probably a lot more oil cooler than you need, and are getting oil temps way below what most racing teams would consider "perfect".
So congrats on that I guess?
Regarding what weight oil to run, that's another question... Related to temp of course, but 50wt for 212F? I don't get that...
I'm running 5w30, could be convinced to run 40wt or more but nothing you've said or shown seems to be any kind of evidence that I need to do so.