Years ago when it looked like the study was going to disappear I
grabbed it and hid it away here:

http://wetwesties1.tripod.com/oilfilterstudy/oilfilterstudy-german.html

The updated original is here:

http://minimopar.knizefamily.net/oilfilters/index.html

Thank you Russ Kinze for taking the time to do this. And for keeping
it online.