Quote:
Originally Posted by amg6975
I agree on changing the oil immediately upon buying a used car but 15 miles is more than enough to get the engine up to temp. I used to drive 15 miles each way, and the oil is at full temp (135, so I have the gauge) after 5 miles or so.
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It depends on your climate/outside temp and your oil viscosity. But generally speaking... driving just 15 mile's is not enough of a drive, to get your engine oil up to temp "fully". Not to mention your trans and diff oils too - those will take longer.
I would say one needs to drive for a longer time period (25 miles/25 minutes or more) to get things up fully. Fully meaning 220'F to 250'F on your oil temp gauge.
Dackel