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Old 01-23-2013, 11:00 AM
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08 335Ci 08 335Ci is online now
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Location: Pocono Mts. Pa USA
Join Date: Nov 2011
Posts: 225
Mein Auto: 2008 335Ci
Oil temp lags water temp by about 50 degrees. So when your oil gauge show 160, your water is already at 210 degrees F.

Coolant only cools the block and head of heat that has traveled THROUGH them. Oil cools the moving parts, pistons, crank, valvetrain, turbos .... where the heat is generated through combustion and friction. Oil temp is a much better indicator of engine condition them water temp. The owner's manual gives a pretty good explaination of this.
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