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Originally Posted by FTD
The engine temp reaches 180 within only two or three miles.
I believe in running up the RPMs, once engine temp, is 180 when possible.
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Just a little FYI - the 180 degrees on your gauge refers to your coolant temperature, not your oil temperature. Oil warms up more slowly than coolant, so keep that in mind. For reference, my old MFA-equipped VR6 would take about 10 minutes to hit 170+ oil temp (a loose "warmed up" temperature), while the coolant would hit the middle (whatever that was, but "warm") in about 3-4 minutes. That was for 5.8 quarts, and I'd imagine the Boxster takes a bit longer, what with almost twice the amount of oil.
Also, letting your car "warm up" isn't a great idea. In addition to not really warming anything up besides the engine (and not the transmission etc), it can foul plugs and plug catalytic converters.
Anyway, to answer the original question, when I drive the IS, I'd guess 5 miles to and 4 miles from work with the random 10+ mile trip thrown in for good measure. When I drive the Boxster (rarely to work - mostly just for kicks), 15-20 seems to be the norm.