I service, maintain and own 14 diesel engine trucks and they have huge filters on them and NO I don't pre fill any filters ever. I also change oil on 8 other passenger cars and trucks since 1981. I'm a oil change expert, can do one in minutes.

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.

I've been changing oil since 1976 and have run millions of miles with out ever a engine failure, I'd say your wasting your time pre filling and maybe run the risk of damage to your engine doing it, according to International trucks.

Last edited by Challenger 1; 02/10/09 02:36 PM.