Oil filter warning


Silverbullitt

Silverbullitt

GT Owner
Mar 3, 2006
1,765
Lago Vista, TX
I ordered the mann filters from germanfilters.com about a year ago. I installed filter #1 then. The test drive revealed reduced oil pressure and zero pressure briefly at idle. Luckily I only went 1 block on the test drive.

I purchased a different brand filter locally and replaced the Mann. Problem solved. I thought I might have tightened the cap too much and obstructed a passage. I changed my oil this weekend and decided to give the Mann Filters another try. This one was a little better, but still zero pressure at idle. The remainder of the case is going in the trash today.

Luckily the local auto parts stores now list filters for the GT.
 
Which brand of filter did you just go with?
Part #?
 
Last time I used an STP filter for the bmw 330. It worked perfectly. I will install a Purolator Premium Plus L25247. It is listed as the GT filter, but it looks small to me. I'll compare it to a new Mann filter since I have 8 new ones left. If it compares on size I'll install it, test drive and post the results tomorrow.
 
Thanks for the update.....

Did you "prime" the system after the change... Hold pedal down and crank for 20 sec...

Silver we know ya but I have to ask sorry
 
BMW uses the same oil filter as our GTs. If you look at the correct Mann filter parts number, you will find this (HU925) affixed to the filter element. It's the same as the one that you get from Ford, except Ford sells it at about six times more $ :rofl (ask me how I know :biggrin)
 
Problem solved. The purolater filter returns 60-75 psi at startup and over 40 at idle. I think the filters from that website could be phony. I agree that they are identical to the Ford factory filters. Maybe the media is too restrictive. Maybe I received a bad batch of filters. Either way no more filters via the internet for me.

I know about the 20 second full throttle starting procedure to prime the system. The zero pressure was happening after about two minutes of running.
 
I would suspect the guage circuit over the ability of a new paper filter to block 40 PSI.
 
If anyone wants my remaining 8 filters they can try one on their car. It is strange that if I use another brand filter the pressure is back up where it should be.

On our indy trip the group would read out temp and oil pressure from time to time. With the stp filter I was right in line with everyone else. I agree that 40 plus psi should blow out the filter, but there is some reinforcement in the plastic tube in the center that could hold the pressure. Either way I'm not risking a $5 savings on a questionable filter.
 
I shipped 4 of these filters to Its Only Money to compare to a Ford filter. Hopefully this is just for R&D. I will never put these in my motor again.
 
Okay let me ask the obvious followup question:

'Anybody else had this pblm after changing their oil & using the Mann filter?

I ask because, if I remember right, pretty much everybody is using the Mann & you're the 1st to have experienced this pblm as far as I know, 'bullit. I'm wondering if, as you suggested, your filter SOURCE was the pblm.
 
I had the GT Guys install a Mann filter on mine. They didn't share any comments good or bad at the time.
 
My only point is that I think that there are counterfeit Mann filters floating around. The filters I shipped today are in green and yellow Mann boxes and they have the proper part number on the filter.
 
Silverbullitt said:
My only point is that I think that there are counterfeit Mann filters floating around. The filters I shipped today are in green and yellow Mann boxes and they have the proper part number on the filter.
Click to expand...


'Just checked the ones I got from Bavarian AutoSport ...'same deal ... green/yellow box ...HU 925 4/x.

Let's see what the feedback is...
 
Empty Pockets said:
Okay let me ask the obvious followup question:

'Anybody else had this pblm after changing their oil & using the Mann filter?

I ask because, if I remember right, pretty much everybody is using the Mann & you're the 1st to have experienced this pblm as far as I know, 'bullit. I'm wondering if, as you suggested, your filter SOURCE was the pblm.
Click to expand...

NO!
 
I just did an oil change using the Mann filter from German filters, Oil pressure at hot idle is 30 to 35, cruise is about 55. The only odd thing is that the filter was a very tight fit onto the center shaft. The old filter also a Mann from German filters looked to be about what I would expect.
 
I use a Mann without any problems.
 
I've done a dozen or more GT oil changes. A few of the early ones were with the Ford-boxed, Motocraft with a Mann filter inside (along with the copper washer that is intendd for a BMW and not our cars) and the majority of the remaining changes with the green/yellow-boxed Mann filters. From very detailed inspection (including Mann designation and part numbers), fit on the plastic shaft, and running oil pressures, the filters are identical. I'm almost convinced that there's a guy in the back room of Ford somewhere whose job is to lift the filter out of the green/yellow Mann box and place it in the Motorcraft box. since the rubber o-ring and the copper washer are packaged together, the copper ring gets to go along in the Motorcraft box.

I am as perplexed as anyone regarding Silverbullitt's experience(s). I have absolutely no doubt of his (bad) experiences, but I also cannot physically explain how an improper filter (which upon removal "appears" normal), could cause the abnormalities that he (unfortunately) experienced.
 
No problems with my MANN HU 925 filters either. Silverbullet, can you post a picture of your "bad" filters? Maybe there is something we can see.
 
Ditto

Used the Mann HU925/4X (Yellow/Green box) last oil change, no problems. Have another change to do shortly and will advise if any thing different develops.
I too am at a loss to understand/explain Silverbullitt's problems. And I believe his account accuracy. Just perplexing......
 
I use the K&N oil filters (no...not the air filters, although I do have these on my car as well) on my GT. Since K&N are filters experts, and I have heard good things about their oil filter materials, I have had no issues with these whatsoever.
 
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