Are we talking oil pressure (in PSI) here or coolant temperature (in degree F)? From the numbers you're throwing around, this appears to be coolant temp, and unless you have added an oil pressure gauge (as I did by installing a 996 cluster) you dont have a readout of oil pressure.
If we're on the same page here, and we're talking about coolant temp, yes, higher elevations can cause increased engine temps due to the engine working harder because of less dense air, and the fact that water boils at a lower temp at altitude.
Patrick
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