I used to just wait until the needle started to move, but then I installed my oil pressure gauge. The oil pressures don't start to drop to the lower operating pressures until 180+. Cooler than that, the pressures are in the 100-105 PSI range when you're around 2-3k RPM. That was enough to make me warm her up to 180F before getting sporty with my driving.
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2013 Cadillac V-Wagon, RIP Z
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