[ Overview | Opinions and Recommendations | Frequently Asked Questions ]
01/25/2008
Moving this article into it's own directory to make things less cluttered. The article has also been converted into a more conventional form with some new information and published in the SDAC Chicagoland newsletter. Those changes and refinements are now pulled-back into the main web article. Also ran a spell checker and did a lot of cleanup.
01/18/2008
Disassembled and measured the Toyota filters, 10 in all.
01/11/2008
I managed to find all of the original photos of the 1999 tests, including the German filters. While the prints are not the best quality due to the lighting capabilities of my long-gone compact 35mm camera, the scanner I have now is far superior. The old parallel port hand-scanner used to scan the original prints had horrible contrast. I believe it died, which is why the photos of the German filters never made it up on the site. All prints have been rescanned with significantly better results in most cases.
01/08/2008
Photographed a few new reference filters and re-verified a few old ones with some interesting results. Updated most of the discussion on the main page. Also photographed 10 Toyota filters and started the page for it.
01/06/2008
Created a list of manufacturers on the top page with exploded views and backplate images. Also created a master list on the main study page showing all brands, models, and vintages and their respective manufacturers. Now updating the text to bring it up to date.
01/04/2008
Took photos of the filters sent to me back in 1999/2000. I've been lugging them around for all of these years and I would like to get rid of them. Some were lost when our garage got flooded back in 2000, but most of them are here.
01/03/2008
Started reworking these pages to organize the data better and prepare for some updates. The first page summarizes the data and links to the specific studies. Also dug through the archives to date the history below.
11/10/2003
Cleaning up the HTML and making minor corrections. I am hoping to finally complete this project soon.
06/20/2000
I have finally updated the Opinions and Recommendations page, which contains my personal opinions and subjective observations in the area of oil filters. It is largely influenced by the information gathered here. My idea when reposting this page was for it to contain only the objective data I gathered and not contain any swaying comments by me. If you want to hard facts, they are here. If you want to hear me rant, see the other page.
There will be few if any further updates this summer. I simply don't have the time to sit indoors and work on web pages right now. I hope to get one more update in later this summer and then wrap up the project this fall/winter. Thanks for the patience.
05/25/1999
Please read the new Warning section now.
A few people out there are helping me by sending filters. Many thanks go to them. I am happy to cut open and evaluate filters of the same type for brands that I have not tested, but I really don't want to try to cover all of the types for other vehicles. The scale of this project has already exceeded my original intentions, but I really want to finish it.
05/07/1999
I have a special feature page for Mopar because that is why this page is here in the first place. The Audi/VW special feature is in progress because I cannot compare the German filters to the Ford 5.0L filter (they do not manufacture a true equivalent). The majority of those filters were sent by Rolf Mair, at his expense. The VW/Audi/Volvo crowd has been helping me out a lot, so I am featuring their coveted filters here.
I encourage anyone out there to repeat this study for their own type of vehicle. Perhaps we can all network our studies together. This may be the beginning of a a major wake-up call for oil filter manufacturers. We're watching you!!!
04/29/1999
I finally got a chance to run a spell-checker though this page.
02/23/1999
Added: Car and Driver, Deutsch, NAPA Gold, STP, and WIX.
02/19/1999
Added: Mobil 1, PowerFlo, Proline, and Quaker State.
02/15/1999
First version of the study done in a more systematic way on the following filters: AC Delco, Fram Extra/Tough/Double Guard, Motorcraft, Pennzoil, and Purolator Premium Plus and Pure One.
02/05/1999
First version of the page discussing oil filter types and construction.
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