Quote:
Originally Posted by AHall
I have never prefilled an oil filter and have performed all oil changes on a car I have driven daily for almost 30 years. I have never had bearing failures that were sufficient for me to notice. I believe the car I have has an engine built like a tank though as it has been through abuse, although it is stock. Also my oil filter is installed horizontally.
I am not sure what they prove by testing the oil from the drum and drained from the engine other than unused oil is cleaner than oil drained from an engine which should be obvious.
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Yeah I mean I have trouble believing this is critical one way or the other but the debate is interesting.
I have to believe after I drain the old oil there is still lubrication for the additional couple seconds it takes to recirculate the new oil, whether or not the filter is prefilled. But maybe not what do I know.