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#4810645 - 07/10/18 07:32 PM Pre-filling filters effect on first startup
VeryNoisyPoet Offline


Registered: 12/16/17
Posts: 318
Loc: Massachusetts
Spin-on filter in my car installs straight up, so I can fill it all the way before I screw it on. Only the galleries need to purge before oil pressure can build. Since I just installed an electronic oil pressure gauge that updates a few times per second, I decided to record what the pressure does on the first startup at my most recent oil change. I used 10w-30 Valvoline Full Synthetic with Maxlife Technology and a Mann W917 filter.



It will be a while before my next oil change, but when that happens I'll do an experiment. I'll use the same oil and filter, but this time I will only put a splash of oil in the filter instead of filling it to the brim with about 1/2 quart. Be interesting to see how much longer it takes to build pressure.
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#4810682 - 07/10/18 08:02 PM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17932
Loc: PNW
If the filter was bone dry, it will probably take 4~5 seconds instead of 2 second to reach full pressure.

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#4810706 - 07/10/18 08:27 PM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
pbm Offline


Registered: 04/19/04
Posts: 7646
Loc: New York
While I don't think adding oil to the new filter is absolutely necessary...I can't see any downside....I've done it for years...and will continue to...
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#4810711 - 07/10/18 08:41 PM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
JLTD Offline


Registered: 12/15/17
Posts: 837
Loc: US
Awesome! This topic has been horse many many times over the years; finally some science to definitively answer the question!

When you post up the next video please make sure to link to this one.

Question for you: any plans to test a 0w30 vs the 10w30? It would I suppose need to be at the same outside temperature but that has been debated here also [insert positive displacement pump discussion here]
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#4810765 - 07/10/18 09:40 PM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
I have timed it on my truck.

FL-820S size (Same size as PH-2, XG2, or PH-16) takes exactly two seconds longer when dry.

I only did it once, for the value of the experiment. It was a warm engine that hadn't been shut off for long.
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#4810844 - 07/10/18 11:19 PM Re: Pre-filling filters effect on first startup [Re: JLTD]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17932
Loc: PNW
Originally Posted By: JLTD
[insert positive displacement pump discussion here]


Oil viscosity shouldn't really matter with a healthy PD pump.

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#4810853 - 07/10/18 11:30 PM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
double vanos Offline


Registered: 08/05/04
Posts: 1915
Loc: 5600 feet elevation, Arizona
People with horizontal mounting filters are SOL I suppose. Canít fill the filter on my 3.5 Ecoboost but I reckon dry filter starts arenít hurting it much.
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#4810872 - 07/11/18 12:55 AM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2454
Loc: Balearic Islands , Spain
No real difference, the oil filter takes in my cars maybe 2 seconds to fill up when you start it after a change, and i can't do it in my cars anyway, in one it's horizontal and on the other in fact at a 45 downward angle!
In fact, Ferrari Colombo V12s have two oil filters and they are both directly pointed downward! and they don't blow up after an oil change do they.
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1999 Peugeot 106 II 1.1 Max, On standby

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#4810903 - 07/11/18 02:22 AM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1927
Loc: Saskatchewan, Canada
As far as I know, the only way to insure high oil pressure at startup is with an oil accumulator (Moroso, etc). It pressurizes the oil system *before* startup.

I don't know if it's necessary; there should be enough residual oil at bearing points for almost no wear for startup and low RPM operation for brief periods. Engine starts do wear more than pressurized operation, but it's low enough that motors last ... well, as long as they last. Maybe an option if you are looking to keep the vehicle forever and are looking to extend engine life beyond, say, 200,000 mi.
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#4810914 - 07/11/18 03:23 AM Re: Pre-filling filters effect on first startup [Re: Johnny2Bad]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17932
Loc: PNW
Originally Posted By: Johnny2Bad
... there should be enough residual oil at bearing points for almost no wear for startup and low RPM operation for brief periods.


Yep ... if these engines in the video link below can run for 10+ minutes with no oil before blowing up, I'd think the residual oil will protect everything for 5 sec or less of running before oil pressure is established.

https://youtu.be/x3CfLBkew2c?t=7m18s

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#4810940 - 07/11/18 05:56 AM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
Sayjac Offline


Registered: 10/13/08
Posts: 12340
Loc: The Old North State
I prefill 'where practicable'. That said, I realize it's more of a 'feel good' practice then something that will have a significant effect on engine wear. Look at how many shops, dealers, indies, and quick lubes that never prefill.

And there's been some posts here in the past about how new unused oil actually has more harmful particles in it then used oil and one should change the filter some time after the OC. Not something I'll ever do no matter the science behind it, but much like prefilling, strokes for folks.

And yes subject has been beaten to death, but so have many topics here.

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#4810949 - 07/11/18 06:40 AM Re: Pre-filling filters effect on first startup [Re: Sayjac]
Dallas69 Online   content


Registered: 02/11/14
Posts: 1679
Loc: Texas
Way too many anal and ocd folks on here these days.
You guys just look for stuff to worry about.
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#4810965 - 07/11/18 07:13 AM Re: Pre-filling filters effect on first startup [Re: VeryNoisyPoet]
Kestas Offline



Registered: 06/04/02
Posts: 12400
Loc: The Motor City
It's a sport around here.

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#4810973 - 07/11/18 07:21 AM Re: Pre-filling filters effect on first startup [Re: Kestas]
Kira Offline


Registered: 08/19/10
Posts: 5454
Loc: Champlain/Hudson Valley
Sis had a 1988 Jeep Cherokee w/ 4.0 I6. 'Twas said the cam and crank pos. sensors BOTH needed to "go through their zeros" for the engine to fire up.
That required 2.5 - 3 seconds whether ice cold or warmed up.

I always thought the engine benefitted from that low rpm cranking as the oil pumped up.

This is separate from the "pre-filling question".

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#4811023 - 07/11/18 08:32 AM Re: Pre-filling filters effect on first startup [Re: Sayjac]
blupupher Offline


Registered: 08/27/04
Posts: 4492
Loc: Katy, Republic of Texas
Originally Posted By: Sayjac
I prefill 'where practicable'. That said, I realize it's more of a 'feel good' practice then something that will have a significant effect on engine wear. Look at how many shops, dealers, indies, and quick lubes that never prefill.

And there's been some posts here in the past about how new unused oil actually has more harmful particles in it then used oil and one should change the filter some time after the OC. Not something I'll ever do no matter the science behind it, but much like prefilling, strokes for folks.

And yes subject has been beaten to death, but so have many topics here.

Basically what I was going to say.

I disagree with the naysayers about the new oil can cause harm. Look at VOA's, insolubles are minimal, lower than or equal to UOA's. Plus the new oil is poured into the top half of the engine, where it would do "damage" to the top end.

And if you have a horizontal mount filter, you can still add some oil too it. I can add about 1/3 a qt to the FL820s size filters on my F150. I just add it and it gets absorbed by the media. Spin it on quickly enough and nothing comes out.

But as said, it just makes me feel good, and if I forget to do it, I don't worry about it.
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1994 Honda VT1100C: Peak 15w-40/TG/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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