Quote:
Originally Posted by ResQguy
Ridiculous noob question here. I always thought you were supposed to change the oil when it was cool?
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Usually you just need to warm the car up for a few minutes for regular oil change BUT if you're taking sample for laboratories to do oil analysis, you have to follow this
Gas Sampling 
Quote:
Run the engine before you take the sample to get the oil at operating temperature (driving about 20 minutes should do it). Getting the oil up to operating temperature should help cook out any normal moisture or fuel build-up.
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