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#4558226 - 10/29/17 09:48 AM Fleetguard LF3681 Question
ChesterCopperpot Offline

Registered: 07/08/17
Posts: 18
Loc: West Virginia
Got one of these today and noticed that the "louvres" look almost closed. Does this seem right? Just want to get a consensus to determine if this is ok to use?


#4558253 - 10/29/17 10:13 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
CT8 Offline

Registered: 10/09/14
Posts: 10925
Loc: Idaho
Return if in doubt.
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

#4558277 - 10/29/17 10:43 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
92saturnsl2 Offline

Registered: 03/02/04
Posts: 1267
Loc: Flaherty, KY
It's fine. I've seen this on the same China/Korea filter you have pictured, and on Hastings filters. Never had a problem on any of them.
1985 F-250HD 7.5L 4x4 135k- Maxlife 15w-40 HDEO [for sale]
04 Odyssey EX 180k PUP 5w-40
96 Maxima GLE 248k Castrol Edge 5w-50
07 Chrysler Pacifica Limited

#4558313 - 10/29/17 11:47 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
danez_yoda Offline

Registered: 07/18/09
Posts: 462
Loc: texas
Second thought about the louvers. (deleted my first comment)

Has anyone ever added up the surface area of all those slits and calculated the pressure drop across them?

The slits look small but I bet the flow plenty since there are so many of them. Far less restrictive than the filter itself.

The slits should stay clean since the filter will catch anything that would plug them.

Edited by danez_yoda (10/29/17 11:52 AM)

#4558351 - 10/29/17 12:43 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
BlueOvalFitter Offline

Registered: 02/28/03
Posts: 6003
Loc: Cajun Country, La.
It's fine. Use it!

#4558490 - 10/29/17 03:25 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
ZeeOSix Offline

Registered: 07/22/10
Posts: 17764
Loc: PNW
Too closed up for my taste. Seen many examples of well formed louvers much wider opened than these.

#4558544 - 10/29/17 04:38 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
JohnnyJohnson Offline

Registered: 10/22/09
Posts: 2731
Loc: Wet side WA
Some people seem very upset with the louvres vs nice round holes. But what's the flow rate and is there really any significant restriction of flow since there seem to be many more of them?

Edited by JohnnyJohnson (10/29/17 04:38 PM)
2004 Toyota Corolla 121598
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74016
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

#4558598 - 10/29/17 05:45 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
WellOiled Offline

Registered: 10/03/15
Posts: 1356
Loc: Houston, Texas
I have always liked the idea of louvres. However, I have seen better formed louvres than what is posted here. I would want a little more opening. Thanks for the post.
2004 Ford Ranger 4.0L V6
NAPA Full Synthetic 5W30 + Fram Tough Guard

#4558635 - 10/29/17 06:24 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
Peter_480 Offline

Registered: 07/03/17
Posts: 122
Loc: New England
Purolator OEM?
'10 Ford E250 4.6L
'11 Ford Fusion 2.5L

#4558655 - 10/29/17 06:51 PM Re: Fleetguard LF3681 Question [Re: Peter_480]
ChesterCopperpot Offline

Registered: 07/08/17
Posts: 18
Loc: West Virginia
I don't think its Puralator. It says "Made in Mexico" which was somewhat disappointing. It doesn't have the traditional date code to indicate Puralator.

#4558973 - 10/30/17 06:48 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
Sayjac Offline

Registered: 10/13/08
Posts: 12248
Loc: The Old North State
Not aware who makes this FG, but overall construction pics, coo, and non Puro date code would indicate not Puro made. Recently another FG posted was made by Champ Labs. Don't think that's the case here though either.

As for louvers, your call. Seen more open ones, however also seen ones that didn't look open down the center tube and once media removed showed plenty of total opening area.

I'd say if in doubt or bothers you, take it back, use something else.

#4559077 - 10/30/17 08:56 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
goodtimes Offline

Registered: 12/08/10
Posts: 2846
Loc: california
There is another set of holes facing the other way. I cut open a Delco I was uncomfortable with, about like these louvers, and it was actually fine. Probably it is a judgement call. Here is a filter cut open that shows the narrow gap between can and element in the first two pictures. By eye the gap probably looks too small. When calculated it should be fine.,049_mil#Post4555425

#4559101 - 10/30/17 09:21 AM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
beanoil Offline

Registered: 10/17/04
Posts: 2951
Loc: Midwest, Illinois
There is nothing wrong with that filter. I see about 60 visible louvers, give or take in pic1. A little less than 1/2 of the tube visible, so what, over 200 slits in the top half alone? Ever see how much fluid can escape a pinhole with 60 pounds of pressure on it?
I'm always surprised when folks question a leading filter manufacturer like FleetGuard. if there was a genereal problem with louvered center tubes, engines would by dying every day, all across the nation.
The Donaldson on my PSD has the same construction. I'm good with it.
beanoil: Tough under heat, real dirty afterwards.

#4559699 - 10/30/17 09:11 PM Re: Fleetguard LF3681 Question [Re: ChesterCopperpot]
DoubleWasp Offline

Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
I had the same doubt about a Purolator Boss center tube, but when I poured oil through it, it went through like a sieve. Under pressure, it would have been a deluge through it.
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

#4561572 - 11/01/17 08:26 PM Re: Fleetguard LF3681 Question [Re: beanoil]
ChesterCopperpot Offline

Registered: 07/08/17
Posts: 18
Loc: West Virginia
"beanoil", thanks for the input and advice. I'm not sure why your surprised when folks question things. This website/forum is full of questions about various topics. I'm sure its in the interest of gaining knowledge.

BTW, the "leading filter manufacturer like "FleetGuard" can't even validate the correct oil filter for my application. They keep telling me to use a different oil filter that clearly based on specifications will not work for my vehicle. I have provided all the data required within reason. Glad I questioned them....