Recent Topics
Medical Errors No. 3 Cause of U.S. Deathss
by doitmyself
05/05/16 02:29 PM
Top Ten Historic Hotel Lacks Designated MC Parking
by LoneRanger
05/05/16 02:19 PM
Toro 120-4276 Oil Filter Cross Ref?
by AirgunSavant
05/05/16 01:42 PM
Using Smoker Indoors
by racer12306
05/05/16 01:23 PM
Misfire and Stumble under load '01 Focus
by Ifixyawata
05/05/16 01:17 PM
Nexus 7 to iPad Mini 4 ?
by Y_K
05/05/16 12:44 PM
2010 camry headlights upgrade
by bmwjohn
05/05/16 12:02 PM
Great presentation on ATF
by Turbo_Lemming
05/05/16 11:59 AM
Great Presentation on Oil Filters
by Johnny2Bad
05/05/16 11:30 AM
long hammer drill bit
by joel95ex
05/05/16 11:25 AM
Mobil1HM 10w-30 vs. 10w-40 in reducing leaks
by 2James1
05/05/16 10:56 AM
Is this a decent price for a Honda mower
by chiefsfan1
05/05/16 10:31 AM
Newest Members
02Maxima, xlittoninjax, Jamer, johaiti, Danielbaja
57803 Registered Users
Who's Online
99 registered (901Memphis, AirgunSavant, aquariuscsm, ABomb369, acmesupply, 12 invisible), 0 Guests and 1 Spider online.
Key: Admin, Global Mod, Mod
Forum Stats
57803 Members
66 Forums
248516 Topics
4064378 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Page 1 of 3 1 2 3 >
Topic Options
#1740205 - 01/12/10 09:39 AM Something my mechanic said. True or False???
BovineScapegoat Offline


Registered: 11/06/09
Posts: 241
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.
_________________________
05 Mazda3 2.0 Castrol Edge 5W30 + Motorcraft FL910S
Redline MT-90, Filtermag, Shark Fin Antenna
07 Focus 2.0 any dino 5W30 + Motorcraft

Top
#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
_________________________
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

Top
#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.

Top
#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.

Top
#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
_________________________
Kaboomba

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



Top
#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.

Top
#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)
_________________________
96 Eldo, M1 5W30 EP
2010 Fusion SEL 2.5L M1 5w20 EP

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


Registered: 09/01/08
Posts: 3006
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.

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


Registered: 08/18/04
Posts: 2851
Loc: Raleigh ,NC CSA
Why would you ever change your oil and not the filter???
_________________________
2012 Porsche Carrera S
1995 Plymouth Voyager

Top
#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.
_________________________
Kaboomba

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



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


Registered: 06/17/05
Posts: 4939
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.
_________________________
I <3 Red Line oil

Top
#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.

Top
#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
_________________________
Kaboomba

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



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


Registered: 05/31/05
Posts: 1693
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)?
_________________________
2005 Nissan Maxima, 6-speed manual; many others...

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


Registered: 05/31/08
Posts: 1006
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.
_________________________
2009 BMW 328Xdrive - BC 0w-40 with Mann filter
2002 Miata LS - PP 5w-20 with Amsoil filter

Top
Page 1 of 3 1 2 3 >