Quote:
Originally Posted by GrandSport
You don't want the engine oil that low. You want it above the boiling point of water or else water in the oil (condensation, etc) will accumulate and never boil off. You want your engine oil around 220. On my truck in Michigan, I added external dedicated trans and engine oil coolers, but I ran them before the in-radiator coolers. This way I got extra cooling but if I over cooled them when I wasn't towing in the winter, the coolant would heat them back up.
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The 180 he is quoting is post-cooler. At 180F, at some point in the system, the oil is over 212F.
Additionally, you don't have to be above the boiling point of water to accelerate evaporation. Observe a pot of water on a stove, warming up. Note the increased evaporation (you can see the vapor!) as the water heats up, but before it is boiling. Also remember that with elevation and vacuum (e.g. negative crankcase pressure), you lower the vapor pressure and boiling point of water below (far below) 212F.
160F is enough heat to safely redline; this is the threshold used by virtually every manufacturer that uses a variable temperature based redline (BMW M cars, Lamborghini, Mclaren, AMG, etc.)