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Originally Posted by spcmafia
Like chipmunk already pointed out, an oil cooler is probably a way better choice than experimenting different oil consistencies.
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It doesn't have to be "experimenting", you should just pick viscosity based on max operating temperature and overall usage. If operating temp is 270F at the track and you don't drive on the street, 10w50 might make sense. Not so much street/track tho... FWIW I've been running 5w30 street/track with no cooler, temps up to 275F at the track. Might go to 0w- or 5w-40 this year...
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Another area I'm seeing, is that if you're constantly hammering the car, oil can get in places it shouldn't, so maybe an oil catch can too?
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Highly doubtful this is needed. My BRZ is the first car I've tracked a lot that didn't use any oil at all at the track. Typically I see 5000 street miles and 4 track days (~2hrs) between changes and I've never had to add oil between changes. In another thread somebody mentioned they added a catch-can and then removed it as it collected next to nothing. These engines are pretty good at containing the oil under track usage.
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Just as a fail-safe measure. Are you also keeping an eye on different fluids such as LSD/Clutch, Transmission?
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For me, I just swap trans and diff fluid out every season or two, never bothered to try to measure temps of these fluids. You could, but then it's the kind of thing where if you see the temps you may then think you "need" a trans cooler and a diff cooler. In reality you probably don't...