Quote:
Originally Posted by ZDan
It doesn't have to be "experimenting", you should just pick viscosity based on max operating temperature and overall usage.
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That might be true for some fixed viscosity base fluids, but with a modern synthetic multi-grade it isn't. Any decent oil is going to have a working maximum temperature well beyond what a 'safe' limit is on an FA engine. There are much more powerful engines out there in performance oriented cars that use 0w20 without issue. The BRZ/GR is no different.
You use the oil the engine was designed for. Get a baseline, and go from there to optimize for your specific use and conditions. Even in the same region, oil that works well for me' my commute and event types, is very likely not going to be the most ideal brand/weight for the next guy. There's no one right answer here.
Quote:
Originally Posted by ZDan
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...
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It's easy enough to establish a baseline of normal and watch it from there. Obviously, as power, mods, driver skill expand beyond 'typical' so too will these temps. The tell-tales stickies are nice, but again if you want to know your fluid is still within good working parameters (not contaminated, sheared down excessively, etc.), send out a sample.
I agree, I see far more oil coolers installed on cars 'because racecar', few know what their oil temps are, and even fewer knew what they even were before installing it. If you really want to be 'because racecar', you only add complexity (DNF potential), weight, and costs, when it's necessary AND going to payback in measured performance and/or reliability improvements.
