Quote:
Originally Posted by 69a
The reason given to me was that if you prefill your filter you risk getting an air lock in your oil pump. Because after an oil change, you have to displace about 4oz of air on the intake side of the pump. Therefore if you have prefilled your filter there can be too much resistance on the upstream side. I was having issues with my 100% MCF system, but turned out to be the incorrect dipstick meaning I was about 2 quarts low.
So now I never bother prefilling, just do your oil change with the engine warm, and start the engine soon after, and make sure you get pressure.
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I had forgotten the details and didn't want to bring it up, but thanks for explaining Mark's reason.
