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FL820S Cut Open - '08 Lincoln Navigator 5.4 #5323905 01/15/20 09:12 PM
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TXCarGeek Offline OP
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Decided to cut open the FL820S that was in my brother's Navigator with ~215k miles. We do oil changes according to the vehicle's oil monitoring system.

The metal end cap fell off of the filter element as soon as I opened it up. The pleating was folded over in one spot and when I pulled one pleat to straighten it out, the media ripped. The media was quite crunchy feeling and I couldn't see past the folded over pleat to show if there was already a small tear present; the big rip happened when I straightened out the pleat, but there was no way to tell what was already there. The material that the metal end cap was adhered to showed signs of falling apart as evidenced by the pieces of it that were caught by the filter media.

My dad and I have been using FL820S filters since 2000 when my family purchased an Excursion that was owned until 2013. We've continued to use them until this last oil change on my brother's vehicle. I was hoping the reputation that the FL820S has on here was slightly overblown and that my used filter would be okay...this unfortunately wasn't the case. I switched over to a Tough Guard and I am hoping that when I cut that one open for the next oil change, that it will present better internal construction than the FL820S has.

IMG-9723.JPGIMG-9724.JPGIMG-9725.JPGIMG-9726.JPGIMG-9727.JPG
Last edited by TXCarGeek; 01/15/20 09:16 PM.
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5323923 01/15/20 09:29 PM
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TXCarGeek Offline OP
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Looking at it closely again, two different pleats were completely torn away from the end cap/base or whatever it is that the filter media attaches to.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5323933 01/15/20 09:42 PM
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Arob Offline
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I stopped using the 820 a few years ago after having low oil pressure warning light flickering. Changed the filter and the light never flickered again. No more 820's in my garage.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5323966 01/15/20 10:25 PM
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blupupher Offline
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I have seen a few filters that the metal caps fall off when cut open (don't remember the brands, think it has been a few different ones).
I don't really know if it affects the filtering ability though.

How many miles was the filter in use for?


'18 Santa Fe: PP 10W-30/OEM
'18 Soul: Synpower 5W-30/PG
'10 Santa Fe: Synpower 5w-30/D+
'04 F150: Magnatec 10w-30/ST
'12 xB: M1EP 0W-20/CQ Blue
'02 F150: Magnatec 5W-20/D+
'94 VT1100: Peak 15W-40/D+
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5324040 01/16/20 03:18 AM
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I would have to look back at receipts to see the exact mileage but we change it according to the OLM on the vehicle...I have no clue what the general mileage range for oil service is on Ford vehicles. If I had to guess though, I would say it’s somewhere between 5000-6000 miles.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5324064 01/16/20 05:05 AM
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dnewton3 Offline
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OP - you didn't mention how many miles in use, but looking at the media it wasn't heavily loaded, so probably not obscene miles. what were the IOLM indications here?

Metal end cap fell off ... that's not typical, even for an FL820.
The adhesion clearly didn't hold up; wonder why?
I continue to be disappointed when I see these examples.
Makes me wonder if there cutting open a bunch of virgin ones would give us some indication of what exists prior to use; what is the propensity for failure even before the lube hits the pleats?

I've used TGs for several years now; been impressed with the build, the efficiency and the price; overall good compromise with positive results.

Last edited by dnewton3; 01/16/20 05:08 AM.

The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5324069 01/16/20 05:22 AM
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Lubener Offline
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I don't know why the 820's are the only ones in the Motorcraft line which are so poorly made. FL1A's sure look a lot better. I stopped using 820's on my 4.6L in favor of the Fram Toughguards and no start up rattle either.

Last edited by Lubener; 01/16/20 05:23 AM.

The "thinking" man's friend.
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: TXCarGeek] #5324132 01/16/20 07:19 AM
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atikovi Online Content
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Originally Posted by TXCarGeek
The metal end cap fell off of the filter element as soon as I opened it up. The pleating was folded over in one spot and when I pulled one pleat to straighten it out, the media ripped. The media was quite crunchy feeling and I couldn't see past the folded over pleat to show if there was already a small tear present; the big rip happened when I straightened out the pleat, but there was no way to tell what was already there. The material that the metal end cap was adhered to showed signs of falling apart as evidenced by the pieces of it that were caught by the filter media.


An oil filter is designed to work as an assembled unit. Cutting it apart and seeing what you saw, is completely out of context. That's like saying a house under construction with only 2 of the 4 walls already up is a poor design if a windstorm blows down those walls which aren't properly supported buy the other two walls and a roof.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: atikovi] #5324178 01/16/20 08:19 AM
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Originally Posted by atikovi
An oil filter is designed to work as an assembled unit. Cutting it apart and seeing what you saw, is completely out of context. That's like saying a house under construction with only 2 of the 4 walls already up is a poor design if a windstorm blows down those walls which aren't properly supported buy the other two walls and a roof.

Yes and no. I agree (and said such above) that I don't know if the failure (and it was a failure) was an issue.
The metal end cap is designed to be glued to the media. It did not stay together as designed, which means it is a failure. Did it cause a problem, no idea.

Your example is flawed, you are using a incomplete object comparing to a complete object.
If the house was complete and the windstorm came, then the walls shifted because the nails used to secure the studs to the foundation did not completely secure it to the foundation, that is more like the filter here.
Not a catastrophic failure, but still a failure


'18 Santa Fe: PP 10W-30/OEM
'18 Soul: Synpower 5W-30/PG
'10 Santa Fe: Synpower 5w-30/D+
'04 F150: Magnatec 10w-30/ST
'12 xB: M1EP 0W-20/CQ Blue
'02 F150: Magnatec 5W-20/D+
'94 VT1100: Peak 15W-40/D+
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: atikovi] #5324180 01/16/20 08:21 AM
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kschachn Offline
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Originally Posted by atikovi
An oil filter is designed to work as an assembled unit. Cutting it apart and seeing what you saw, is completely out of context. That's like saying a house under construction with only 2 of the 4 walls already up is a poor design if a windstorm blows down those walls which aren't properly supported buy the other two walls and a roof.

That analogy makes no sense whatsoever. That filter failed to perform its primary function, plain and simple


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: kschachn] #5324186 01/16/20 08:28 AM
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Originally Posted by kschachn
Originally Posted by atikovi
An oil filter is designed to work as an assembled unit. Cutting it apart and seeing what you saw, is completely out of context. That's like saying a house under construction with only 2 of the 4 walls already up is a poor design if a windstorm blows down those walls which aren't properly supported buy the other two walls and a roof.

That analogy makes no sense whatsoever. That filter failed to perform its primary function, plain and simple


I didn't read anywhere in the OP that they had any issue with the filter before cutting it open. All the issues mentioned were a conclusion based on cutting open the case, which unless you're a filtration engineer, is just speculation.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: atikovi] #5324189 01/16/20 08:33 AM
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kschachn Offline
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Originally Posted by atikovi
I didn't read anywhere in the OP that they had any issue with the filter before cutting it open. All the issues mentioned were a conclusion based on cutting open the case, which unless you're a filtration engineer, is just speculation.

You mean the photograph of torn media is speculation?


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: kschachn] #5324194 01/16/20 08:44 AM
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Originally Posted by kschachn
Originally Posted by atikovi
I didn't read anywhere in the OP that they had any issue with the filter before cutting it open. All the issues mentioned were a conclusion based on cutting open the case, which unless you're a filtration engineer, is just speculation.

You mean the photograph of torn media is speculation?


Well sure, once you take apart the structure of the housing that holds it together and handle it with your fingers, it's bound to tear. Kinda like saying, toilet paper that gets wet and now tears easily is defective.

Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: atikovi] #5324197 01/16/20 08:50 AM
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kschachn Offline
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Originally Posted by atikovi
Well sure, once you take apart the structure of the housing that holds it together and handle it with your fingers, it's bound to tear. Kinda like saying, toilet paper that gets wet and now tears easily is defective.

Ahhh okay, the illustrated failure was induced by the OP. That of course is the only reasonable argument one can make if you wish to somehow relieve the filter manufacturer of any responsibility. The only problem is that you have to make the same argument for all such observations by every individual.

On the other hand, why don't we see similar tears on nearly every cut open filter if it's that easy to do?


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: FL820S Cut Open - '08 Lincoln Navigator 5.4 [Re: kschachn] #5324202 01/16/20 08:58 AM
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Originally Posted by kschachn
Originally Posted by atikovi
Well sure, once you take apart the structure of the housing that holds it together and handle it with your fingers, it's bound to tear. Kinda like saying, toilet paper that gets wet and now tears easily is defective.

Ahhh okay, the illustrated failure was induced by the OP. That of course is the only reasonable argument one can make if you wish to somehow relieve the filter manufacturer of any responsibility. The only problem is that you have to make the same argument for all such observations by every individual.

On the other hand, why don't we see similar tears on nearly every cut open filter if it's that easy to do?


Who knows? Send it off for forensic examination if you have a few thousand bucks to spare. For all we know, one that tears when taken apart might mean the media is less dense and thus flows better than other filters that wouldn't tear.

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