I only sell Mahl or Mann - mostly Mahle $6.36 each.
I have some original Porsche NIB Puralator filters as well.

 

Hi,
glork98 - The 928's lubrication system does include by-pass(es). However, the filter's internal by-pass prevents the filtration media becoming damaged - it operates on the differntial pressure across the filration media. Many sub standard filters have very substandard by-pass valves that are either open almost all of the time, leak and/or are inclined to fail on the high side and this damages the media and can lead to casing failure as noted by Mark

Amsoil do market filters. They sell Donaldson filters too (not for 928s) which are of the highest quality, I have used their (Donalson's) filters on my heavy trucks in preference to the OEM filters from Detroit

OT - I pioneered the use of their "Synteq" synthetic filtation media in this country nearly a decade ago (very expensive but extremely effective too)
One benefit of Synteq is it's very "rational" fibre structure (when compared to cellulose) and this enables the filter to come off differential by-pass at around 40C compared to 80C when using a 15w-40 lubricant. Synteq is 80% effective with 5micron debris versus 28% for a typical cellulose structure

Roger - I think Purolator was the OEM supplier to Porsche for many many years

Like oils aren't oils - filters aren't filters!

I hope this is of interest

Regards

 

Of great interest to me Doug...As always, thanks for your insight.

 

You guys may find this hard to believe. i dont use amzoil wheel bearing grease. (it sucks, and got real thin during racing conditions and leaks out of the cap!)
for this reason, i was supicious of the gear oil too, so i only use redline N/S and regular mix 3 to 1.
Filters, nah, i dont think they make them either for the 928

mk

 

Many vintage Ferrari's I see have duel Fram filters up top. I'm not talking about 308's either but V12 cars from the 60's and 70's.

 

Hi,
the pollution of many "Brands" has been caused by "off shore" manufacturing. Some are of excellent quality and others aren't! One filter maker for instance may make many filter Brand names and each make look the same but have serious variances regarding internals and etc. - price driven of course

It is a case of buyer beware!

For instance many "pattern" parts made in the old "East Germany" were of truely excellent quality and were commonly available throughout much of Western Europe. Some of these suppliers are now online as OEM suppliers as they should be

Fram and Purolator were two icons in the filtration field - sadly this no longer always appears to be the case. Brand engineering has its darker side!

Regards

 

It was. When they changed to Mann or Mahle which ever it is now? Year ago I took out one Purolator from '86 32V ROW engine which had been out from car for years due to 2/6 rod bearing failure. All parts which were not affected by bearing pieces in oil system looked very good so engine was very little used when bearing problem hit. It would be interesting to know when Porsche changed OEM filter from Purolator to something else. It would give some idea if this engine was on the back room of German VW dealer 10, 15 or 20 years.

 

Do we really have any other choices but Mann or Mahle (or Porsche)? I've seen a Fram part number, but nobody carries it , fortunately.

 

I used a Wix filter once, IIRC specs were the same as stock including bypass.

 

Hi,
Erkka - When I lived in Copenhagen in the 1960s Purolator was a Porsche supplier and I believe Wix and Fram were then as well. Consolidation of the German Auto Industry was well underway into the early 1970s and I suspect by the late 1980s the "joint ventures" were complete. During this time the larger vehicle Manufacturers positioned their preferred suppliers very well.
At that stage DB nearly went belly up along with SAAB-Scania (you may remeber their fight with Volvo) and etc. During this period DB commenced manufacturing the Auto transmissions in the 928s. Previously they were a joint venture with ZF etc. They also commissioned the most automated heavy truck assembly plant in the world at the same time

My guess would be that MANN (who now manufacture throughout the world including the US) - and under various names - was the/a prime supplier to Porsche from around then

Bill - I believe that there is or was a M1 Filter for a 928 - there is for 944S2s etc. (don't tell Kibort!)

Regards

 

This time around, after we had changed the oil, I realized that I could not find the Mahle that I had saved. Ran out and the only filter I could find was a "Carquest" for my S-4. I check my oil every day, and the oil looks good and no leaks. I've since bought a coupld of Mahles for future oil changes

 

I clicked on this thread JUST for the inevitable Amsoil joke...

 

I just bought some new Bosch 928 premium filters.
0 451 103 215 about $1 more than the Mahl.

 

...........manufactured by?

 

Hi Roger/Malcolm,

as I understand it most Bosch filters are manufactured by Champion Labs who make a wide range of filters that are sold under various "Trade" names. Some may be made "off shore"

If "Made in Germany" is stamped on them they are likely to be made by a Bosch sub-contractor in Germany

Regards