It's not the runs up to redline but sustained high RPM that becomes a problem. If you're downshifting hard into a turn and take the turn at 5500rpm, then run to redline through the gears, you'll overheat in any ambient temp. So yes, a canyon run can easily skyrocket oil temps if you're maintaining high RPM. If you're having problems though, there are a couple simple steps that can keep you driving (at a slower pace). 1) slow down (ie use lower revs...obvious, I know), and 2) turn on the AC...in the Z, a secondary radiator fan comes on with the compressor and actually cools the engine oil by about 10-15F.
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2013 Cadillac V-Wagon, RIP Z
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