Quote:
Originally Posted by roadie
... normal seems to be anywhere from 220-260. Where did the assessment of 250 or so being abnormal come from? Driving up the mountains the other day I saw 245 max, and in town can vary between 210 and 230 typically, on an average day at 85 degrees.
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Most synthetic oils still do an adequate (not great, but good enough) job of lubricating up to 300F. But the engine itself will not handle temps that high - pre-ignition becomes a problem at elevated temps, plus aluminum engines don't handle high temps very well. The "250 or so" figure is based on "normal" operating temps, where the nannies start to kick in, how important driver thinks oil temp is, etc.