Quote:
Originally Posted by mountainman
Ditto. Also the design of the flat six engine makes for slow draining of the last remaining oil and even warm should drain for at least 30 minutes. if it were cold it would tale longer still with poorer results.
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I understand the slow draining of the flat six. But with my method, the car has been draining for 12-15 hrs. (It has all gathered in the oil sump over night). As far as the sludge, your car is at operating temp when you park it, so I'm assuming the sludge will settle in the oil sump at this time.
I could be completely wrong, but I think the oil companies suggest bringing the car to operating temp because many people don't have the option to change the oil were the car sits overnight (without starting). Therefore, if you start the car (pumping the old oil through the system) it is crucial to bring it to operating temps to not leave the sludge behind and allowing the oil to flow.
I'm not an expert, just my theory lol.