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I do notice that when pulling a hill, the oil temp (meas at the cooler) goes up with higher RPM... and down when I shift up to lower RPM. At first I thought that maybe the fan was cavitating at higher RPM but when I upshift to a lower RPM the engine puts out less HP at the same throttle position which jives with what your saying. This is getting more evident as my engine gets older, and is REALLY evident at higher elevations where the air is thin. Question is.. at say 3/4 throttle what is the best RPM to shift up/down for hills? Oh boy!! looks like I need MORE GAUGES!! a couple head temp guages and Ill never look up to see the road!! Keith > please remember, engine load determines oil temp, not rpm. rpm determines head temp. technically, you can run hotter oil due to engine load and still have a the heads run cool. an example is if you pull a long grade. oil temps climb due to load, but often cylinder temps go down becaues the air/fuel mixture goes fuel rich and rpms aren't as high. > > Brian Fye-- http://www.geocities.com/menacefye > 64 Notchback, 64 Notch Speedster, 67 Squareback, 73 Squareback, 74 412 Squareback Automatic, Wedgechop Drag Bug > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >