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My engine oil would barely reach 160 F in round trips that were 15-20 miles in the summer with my aircooled Beetle. It has an oil cooler with air running through it all the time that the engine is on, but it also has a turbo that is sending a trickle of real hot oil back to the sump. Also had over 5 qrts if oil and external oil filter in play as well. Unless I'm revving a lot down the highway for any decent amount of time and I'm only running 50 mph down secondary roads at most it doesn't get warm. I've seen it at 260 at 3800rpm on a 100 degree day after some time on the highway. Very interesting thread.
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