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Originally Posted by larez2
...I read on renntech.org that you are supposed to change the oil only when the engine has been brought up to operating temperature, so that means the oil will be hot - I personally can't see how it would make that much of a difference as long as you drain the old oil for a long time, like 20mins +.
Larez2
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Hi,
Old thread, I was doing some idle catching up and found it. There are actually
two reasons why you want to run the Car and warm it up before changing the Oil.
First, warming it up allows it to Flow easier and so you get more of the old Oil out.
Second, and more importantly, quite a bit of the dirt suspended in the Oil will settle out once the Oil is stagnant and cool. Warming up the engine allows the Oil to pick up this dirt once again so it is flushed from the Engine with the Oil. The Primary reason for changing the Oil at the Service Interval is to remove this dirt, not because the Oil's Lubricating Capacity has expired. Hope this helps...
Happy Motoring!... Jim'99