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I've been to 3 Navistar factory engine schools and they warn you never to pre fill a filter because that oil or fuel won't be filtered upon fire up.




The '81 Mack R686ST I used to drive wouldn't start no matter how long you cranked it. Filled the filter and it was instant!



I guess before putting and engine together you need to filter the oil before installing the pistons? I usually dip them in 50-50 oil and STP.






I have built many engines and use 10w hydralic oil(aw32) on my sleeves and pistons. Heavy oil and stp is not helping the rings to seat and seal.