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#1740205 - 01/12/10 09:39 AM Something my mechanic said. True or False???
BovineScapegoat Offline


Registered: 11/06/09
Posts: 235
Loc: Southern Ontario
My friendly neighbourhood mechanic has a theory that I wonder if it is true. He believes that when the oil is changed and the filter is NOT changed the new oil pushes contaminants out of the old filter. Essentially causing excess wear.

Your thought BITOGers.
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05 Mazda3 2.0 Castrol Edge 5W30 + Motorcraft FL910S
Redline MT-90, Filtermag, Shark Fin Antenna
07 Focus 2.0 any dino 5W30 + Motorcraft

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#1740209 - 01/12/10 09:44 AM Re: Something my mechanic said. True or False??? [Re: BovineScapegoat]
DieselTech Offline


Registered: 10/27/09
Posts: 1969
Loc: AZ
Thats why he's a mechanic and not a technician
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03 Ford F250 7.3 (Lots of Mods). Redline & baldwin 7039
07 Ford F150 fill. Penz Ultra 5-20 & Bosch 3410
99 ford F150 4.6 fill. Redline 5-30 & P1

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#1740211 - 01/12/10 09:44 AM Re: Something my mechanic said. True or False??? [Re: BovineScapegoat]
ctc Offline


Registered: 11/05/08
Posts: 488
Loc: VA
False. The only problem I see w/ reusing a filter is it getting clogged.

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#1740214 - 01/12/10 09:46 AM Re: Something my mechanic said. True or False??? [Re: BovineScapegoat]
mechanicx Offline


Registered: 10/23/09
Posts: 8576
Loc: Ohio
I don't see any real reason why new oil would push more contaminates out of the oil filter.

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#1740218 - 01/12/10 09:52 AM Re: Something my mechanic said. True or False??? [Re: mechanicx]
Kaboomba Offline


Registered: 10/05/09
Posts: 782
Loc: SE WI, USA
While the mechanic may be wrong on this 95% of the time, I think it would be possible for this to happen IF

1. The OCI was WAY too long and the oil had time to break down and form gooey sludge that then was caught by
2. mediocre filter (sub-PureOne grade)which was left installed when
3. new oil with fresh additives was put in, which broke down some sludge and allowed the fine contaminants trapped in it to pass through the filter
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Kaboomba

94 Buick Park Ave 108K miles, aging gracefully though totalled!
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#1740219 - 01/12/10 09:53 AM Re: Something my mechanic said. True or False??? [Re: mechanicx]
Johnny Offline


Registered: 05/27/02
Posts: 14013
Loc: Retired | Wausau, WI
The only thing new oil would push out of a dirty oil filter is the dirty oil that's in the dirty oil filter.

Why folks don't change their filter when they change their oil is beyond me.

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#1740221 - 01/12/10 09:55 AM Re: Something my mechanic said. True or False??? [Re: mechanicx]
willix Offline


Registered: 12/16/09
Posts: 1889
Loc: minneapolis mn
If the filter media becomes restricted and the system to go into relief and will wash some of the particals back into the system from the dirty side of the media.


Edited by willix (01/12/10 09:56 AM)
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#1740224 - 01/12/10 09:56 AM Re: Something my mechanic said. True or False??? [Re: Johnny]
gfh77665 Offline


Registered: 09/01/08
Posts: 2314
Loc: Southeast Texas
Originally Posted By: Johnny

Why folks don't change their filter when they change their oil is beyond me.


Me too! People outsmart themselves, IMHO.

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#1740226 - 01/12/10 09:56 AM Re: Something my mechanic said. True or False??? [Re: willix]
rshaw125 Offline


Registered: 08/18/04
Posts: 2525
Loc: Raleigh ,NC CSA
Why would you ever change your oil and not the filter???
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2012 Porsche Carrera S
1995 Plymouth Voyager

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#1740236 - 01/12/10 10:03 AM Re: Something my mechanic said. True or False??? [Re: rshaw125]
Kaboomba Offline


Registered: 10/05/09
Posts: 782
Loc: SE WI, USA
Originally Posted By: rshaw125
Why would you ever change your oil and not the filter???


If you were me and you installed an oversized synthetic filter (check out my FleetGuard LF3554, baby), you may not need to change the filter every OCI.
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Kaboomba

94 Buick Park Ave 108K miles, aging gracefully though totalled!
95 Merc Sable 92K miles, raised from the dead by me



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#1740239 - 01/12/10 10:06 AM Re: Something my mechanic said. True or False??? [Re: Johnny]
chevrofreak Offline


Registered: 06/17/05
Posts: 4911
Loc: Billings, MT
Originally Posted By: Johnny
The only thing new oil would push out of a dirty oil filter is the dirty oil that's in the dirty oil filter.

Why folks don't change their filter when they change their oil is beyond me.


We've seen wear numbers decrease in UOA's on the second use of a filter.
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#1740242 - 01/12/10 10:10 AM Re: Something my mechanic said. True or False??? [Re: Kaboomba]
Johnny Offline


Registered: 05/27/02
Posts: 14013
Loc: Retired | Wausau, WI
No doubt your synthetic filter media in your Fleetguard does an excellent job of filtering. However, your oversized filter just has more dirty oil in it than the regular size filter does.

Change the oil and filter at the same time for the best protection. Filters are the cheapest part of the oil change.

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#1740243 - 01/12/10 10:11 AM Re: Something my mechanic said. True or False??? [Re: chevrofreak]
Kaboomba Offline


Registered: 10/05/09
Posts: 782
Loc: SE WI, USA
Originally Posted By: chevrofreak
Originally Posted By: Johnny
The only thing new oil would push out of a dirty oil filter is the dirty oil that's in the dirty oil filter.

Why folks don't change their filter when they change their oil is beyond me.


We've seen wear numbers decrease in UOA's on the second use of a filter.


...which is due to "caking" that occurs as the filter pores start to fill up. With a premium, high-capacity filter, this can result in a very loooooooooong filtration "sweet spot" where efficiency is very good.

K
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Kaboomba

94 Buick Park Ave 108K miles, aging gracefully though totalled!
95 Merc Sable 92K miles, raised from the dead by me



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#1740245 - 01/12/10 10:16 AM Re: Something my mechanic said. True or False??? [Re: chevrofreak]
crw Offline


Registered: 05/31/05
Posts: 1640
Loc: Pocatello, ID
Well, I almost always change the filter anyway. I just can't stand the idea that "some" oil, a half-quart or maybe a quart stays behind and doesn't get changed when you change the oil.

I'm far from a tribologist, so you might shoot my reasoning full of holes. I am an engineer...

If your OCI is 5K, then if you change the filter only every other time, some significant amount of your oil will be in there for 10K. Would not that portion of the oil, those oil molucules, be more apt to break down, to form acids or sludge?

For me, particles are not the issue. If you're going to change the oil, why not change ALL of the oil (as much as is possible)?
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2004 Mini Cooper -- 1975 BMW 2002 -- a bunch of others...

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#1740250 - 01/12/10 10:23 AM Re: Something my mechanic said. True or False??? [Re: Johnny]
Pesca Offline


Registered: 05/31/08
Posts: 823
Loc: Montreal, Quebec in Canada
Originally Posted By: Johnny
Why folks don't change their filter when they change their oil is beyond me.


When you change your oil with a fluid extractor (Mityvac in my case), and the filter is at the bottom of the engine, it allows yourself to get dirty only every other time.
Since it is in the manufacturer recommendation to change the oil filter every other time, I take advantage of it and stay clean.
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2009 BMW 328Xdrive - GC 0w30 with Mann filter
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