PreFill the Oil Filter? --- or -- put it on Dry?
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Lead Driver
Joined: Aug 2022
Posts: 5,065
Likes: 1,415
From: Oologah, OK
PreFill the Oil Filter? --- or -- put it on Dry?
if you are into the Tiny Tid Bits of arguing the difference,
you will enjoy this video.
the Oil Geek has facial emotions, and voice influences that sort of aggravate me,
but, he only goes with Scientific Facts that can be proven.
unlike that other jerk we know so well, that is a bluff and huff.
for me, with the 7.3L HEUI injectors
I'm not worried about the first 2 seconds that crankshaft is turning over...
my engine never starts immediately anyway, it is 3 to 5 seconds before it fires up.
and he runs Dyno tests on 5w20 vs 5w40 vs 5w50 vs 20w50
you will enjoy this video.
the Oil Geek has facial emotions, and voice influences that sort of aggravate me,
but, he only goes with Scientific Facts that can be proven.
unlike that other jerk we know so well, that is a bluff and huff.
for me, with the 7.3L HEUI injectors
I'm not worried about the first 2 seconds that crankshaft is turning over...
my engine never starts immediately anyway, it is 3 to 5 seconds before it fires up.
and he runs Dyno tests on 5w20 vs 5w40 vs 5w50 vs 20w50
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
I never bother with pre-fill. Sometimes I'll start the engine and then remove the drain plug and let it run until the HPOP runs itself out of oil as well so I can get a true 100% oil drain. Pour in new oil and the longest crank time that I've ever had to give the poor starter is maybe 30 seconds.
The other scenario is just drain the oil and change the filter. Starts immediately and never skips a beat. Oil pressure guage rises up long before the HPOP reservoir runs dry and the engine runs smoothly the whole time without any signs of struggle.
Bottom line is there is plenty of residule oil coating the bearings to give adequite lubrication at idle for a few seconds of operation before the oil pump picks up the new oil and normal operations are resumed.
The other scenario is just drain the oil and change the filter. Starts immediately and never skips a beat. Oil pressure guage rises up long before the HPOP reservoir runs dry and the engine runs smoothly the whole time without any signs of struggle.
Bottom line is there is plenty of residule oil coating the bearings to give adequite lubrication at idle for a few seconds of operation before the oil pump picks up the new oil and normal operations are resumed.
Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
I never bother with pre-fill. Sometimes I'll start the engine and then remove the drain plug and let it run until the HPOP runs itself out of oil as well so I can get a true 100% oil drain. Pour in new oil and the longest crank time that I've ever had to give the poor starter is maybe 30 seconds.
The other scenario is just drain the oil and change the filter. Starts immediately and never skips a beat. Oil pressure guage rises up long before the HPOP reservoir runs dry and the engine runs smoothly the whole time without any signs of struggle.
Bottom line is there is plenty of residule oil coating the bearings to give adequite lubrication at idle for a few seconds of operation before the oil pump picks up the new oil and normal operations are resumed.
The other scenario is just drain the oil and change the filter. Starts immediately and never skips a beat. Oil pressure guage rises up long before the HPOP reservoir runs dry and the engine runs smoothly the whole time without any signs of struggle.
Bottom line is there is plenty of residule oil coating the bearings to give adequite lubrication at idle for a few seconds of operation before the oil pump picks up the new oil and normal operations are resumed.
The only way to get anywhere near most all the oil out is to pull all of the injectors every oil change.
To each his own though. Do what feels good to you.
Super Moderator
Joined: Dec 2011
Posts: 13,308
Likes: 6,081
I pre-fill all vertically oriented oil filters whose openings face upwards on any engine... but make a special point to do so on the 7.3L diesel, since the fuel injection system relies on oil actuation, and since the 1.5 quart filter can itself is so large, I'd rather displace all that air with as much oil as I can (without spilling) before sealing it up to the engine.
I dislike the Duramax oil filter's horizontal orientation. It is the one (and only) complaint that I have ever had with any of the Duramax diesels I have experienced (LBZ, LML, L5P).
I guess this means I really like pre-filling oil filters?
I dislike the Duramax oil filter's horizontal orientation. It is the one (and only) complaint that I have ever had with any of the Duramax diesels I have experienced (LBZ, LML, L5P).
I guess this means I really like pre-filling oil filters?
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Butt-Head
Joined: Apr 2004
Posts: 9,448
Likes: 2,934
From: Reed Point, MT
I pre-fill all vertically oriented oil filters whose openings face upwards on any engine... but make a special point to do so on the 7.3L diesel, since the fuel injection system relies on oil actuation, and since the 1.5 quart filter can itself is so large, I'd rather displace all that air with as much oil as I can (without spilling) before sealing it up to the engine.
I dislike the Duramax oil filter's horizontal orientation. It is the one (and only) complaint that I have ever had with any of the Duramax diesels I have experienced (LBZ, LML, L5P).
I guess this means I really like pre-filling oil filters?
I dislike the Duramax oil filter's horizontal orientation. It is the one (and only) complaint that I have ever had with any of the Duramax diesels I have experienced (LBZ, LML, L5P).
I guess this means I really like pre-filling oil filters?
The smaller filters on gas rigs don't bother me too much.
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Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
You still have over 2.5 quarts in there between both of the heads when the high pressure pump starts sucking air. Once the pump gets air, the engine stalls because the air compresses. The lines and rails in the heads are still full.
The only way to get anywhere near most all the oil out is to pull all of the injectors every oil change.
To each his own though. Do what feels good to you.
The only way to get anywhere near most all the oil out is to pull all of the injectors every oil change.
To each his own though. Do what feels good to you.
Laughing Gas
Joined: Jun 2013
Posts: 1,097
Likes: 514
From: Yokosuka Japan
i am in the prefill camp as it costs me nothing. If you warmed it up prior to draining the oil, the bearings have enough film that they are probably safe... but why run it dry dry if you can help it?
just my 3.2¥ worth. Yen rates killer folks! everything is cheaper for me locally, and as i buy my car parts form the states and ship to the base... My price for that does not change at all
just my 3.2¥ worth. Yen rates killer folks! everything is cheaper for me locally, and as i buy my car parts form the states and ship to the base... My price for that does not change at all