My car has an extra few inches of space that could easily accommodate a longer filter than the FL820S. I don't want one that will have the wrong bypass pressure setting, or have the bypass on the opposite end of the filter from the FL820S. Does anybody know if there's compatible Motorcraft filter I could use?

It's a 1996 Ford Crown Victoria P71 4.6L SOHC V8 if you need to know.

Why would you want to do that? It's one of the larger filters out there nowadays...and at 3.38 at Walmart, it's a darn good value. I run mine 10,000 miles in a Modular 4.6, with insoluables at less than 0.2.

I want to start stretching my OCI's to 5K. I just figure that there's nothing wrong with more filter media, especially since a longer filter will fit with ease.

a while back i listed about 20 large size filters that will work for the fl820s.use the search button.

It won't hurt, but, it won't help. 5000 miles isn't stretching this filter at all. In fact, since filters get MORE EFFICIENT as they are used longer, simply adding more and more filter media isn't "better", unless there is some problem you are battling...such as loosening a lot of gunk with an Auto RX treatment. Otherwise, worry about a meteorite hitting your car...it's more likely to occur, compared to the standard FL820S being somehow related to the engine lasting less than about 300,000 miles. B-)

Let's see what we can pull out of our behinds

This one even is a Ford part number (Euro)

Part Number: 51087
UPC Number: 765809510876
Principal Application: Ford European-Dorset Engs.
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 5.477
Outer Diameter Top: 3.661
Outer Diameter Bottom: Closed
Thread Size: 22X1.5 MM
By-Pass Valve Setting-PSI: 19
Anti-Drain Back Valve: Yes
Burst Pressure-PSI: 355
Max Flow Rate: 11-13 GPM
Nominal Micron Rating: 24

Part Number: 51592
UPC Number: 765809515925
Principal Application: Cummins, Komatsu, Onan Engines
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 5.214
Outer Diameter Top: 3.663
Outer Diameter Bottom: Closed
Thread Size: 22X1.5 MM
By-Pass Valve Setting-PSI: 18-20
Burst Pressure-PSI: 250
Max Flow Rate: 11-13 GPM
Nominal Micron Rating: 16

Gasket Diameters
Number O.D. I.D. Thk.
15614 2.834 2.462 0.255

Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.834 2.462 0.200

OEM size:

Part Number: 51372
UPC Number: 765809513723
Principal Application: Ford/Lincoln/Mercury (91-08), Mazda (00-08), Cadillac STS-V, XLR-V (06-08)
All Applications
Style: Spin-On Lube Filter
Service: Lube
Type: Full Flow
Media: Paper
Height: 4.167
Outer Diameter Top: 3.660
Outer Diameter Bottom: Closed
Thread Size: 22X1.5 MM
By-Pass Valve Setting-PSI: 16
Anti-Drain Back Valve: Yes
Beta Ratio: 2/20=12/25
Burst Pressure-PSI: 275
Max Flow Rate: 11-13 GPM
Nominal Micron Rating: 19

Gasket Diameters
Number O.D. I.D. Thk.
Attached 2.834 2.462 0.200

AutoRX is indeed something I'm considering doing, and that's what actually gave me the idea of going with a larger filter. I figured I'd just keep using the larger filters.

I gave up after 5 pages, I guess I should have gone a bit deeper. Thanks.

Gary, thanks for the part numbers as well :)

I have run 5000 mile OCI's with an FL 820s for the years

The only issue I can think of is from what I have seen for the non-Ford FL-820S type fitment filters is the bypasses are all set way high except Fleetguard's (made by Cummins). The Ford OEM filters are made by Purolator.

Fleetguard makes a part number, the LF16002 with the bypass set to the same 55 kPa (7.98 psi) as Ford OEM filters, and synthetic media comparable to the Amsoil EaO. The synthetic media offers more consistent filtration and better flow than other filters. The only thing different in construction is the bypass is at the dome end rather than the thread end when compared to the Purolator made Ford filters.

5k isn't "stretching" for a Motorcraft filter...not by a long shot. Thousands and thousands of cop cars, taxis, etc go that far and last 250,000 miles (and more) easily.No need to use a larger filter for ARx, just use a cheap one during the cleaning and rinse phases, then go back to the FL820S when you're done. Your motor will love you for it!

Over at the Ford truck forum, there's a lot of discussion about Ford's going to 7,500 recommended OCI's, and they use the standard 820S.

I have a 2005 Ford 3.0L using 820S and cut one open after 5K miles.

I posted pictures and comparative analysis (to other app's). See Tale of Three Filters in this forum.

My conclusion was the FL-820S looked like it could go 10K miles in my app. So Ford's 5K warranty and even there newer 7.5K recommendation looks conservative.

Base end bypass, silicon ADBV, and PureOne-like performance at $3.48 walmrt...what is not to like ???

I forget if I mentioned it, but, I go 10,000 plus miles with an FL820S on my 04 Gramp Marquis with insoluables less than 0.2.