Dumb Question - Changing Oil Filter
Lead Driver
Joined: Jun 2004
Posts: 6,366
Likes: 595
From: Amarillo, TEXAS!
I was at a truck shop a few years ago, and one of the mechanics was changing the fuel filters on a semi. He said watch this. He took the new filter and put it on top of the old filter, and turned them upside down. He said I bet you never saw that done before. I had to agree with him, I have never seen an idiot dump the fuel out of a dirty filter and put it in a new fuel filter.
It's a Van Gogh
Joined: Feb 2010
Posts: 7,813
Likes: 1,335
From: Elk Grove, CA
I never use to put oil in the new filter before install but with these ELF 7405 you might need a little because I did not fill it the first time and I swear the hpop made some awful noise trying to get oil that was being drawn in at the filter and not making it fast enough up to the top of the engine. While I can't prove that was the case, sure sounds good to me 
Cargo Master
Joined: Nov 2006
Posts: 2,171
Likes: 20
From: Denton, TX
I gotta jump on the prefill bandwagon. The little piddly filter on the wife's 5.0 explorer is too horizontal to try. But the big filter on my truck gets prefilled.
I agree that not being careful could introduce contaminants into the oil and filter when prefilling. But even with gallon jugs you do the same motions, 5 times, filling the crankcase. By this reasoning I shouldn't refill my crankcase... But because of this thread I will make a better effort in wiping my jugs cleaner before I pour. Thanks for the caution.
Also, does anyone know if the oil flows into the center threaded hole and out of the smaller holes or the other way around? If it is into the center hole, then use a funnel and every drop of your contaminated pre-fill oil is filtered.
I learned the hole punch technique here, and I use it every time.
I agree that not being careful could introduce contaminants into the oil and filter when prefilling. But even with gallon jugs you do the same motions, 5 times, filling the crankcase. By this reasoning I shouldn't refill my crankcase... But because of this thread I will make a better effort in wiping my jugs cleaner before I pour. Thanks for the caution.
Also, does anyone know if the oil flows into the center threaded hole and out of the smaller holes or the other way around? If it is into the center hole, then use a funnel and every drop of your contaminated pre-fill oil is filtered.
I learned the hole punch technique here, and I use it every time.
Senior User
Joined: Sep 2004
Posts: 309
Likes: 1
From: Livermore,CA.
Yup, got the poke a hole to drain here... What I did was get an old phillips screwdriver and sharpened to a point. When the filter is done draining, I get a screw and screw it into the hole, no drips.
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