keep an oil on a weekly basis. I added seafoam to my oil just before doing my last oil change and it seemed to have help.
had a discussion with some of the guys on 6mt.net if oil additives work. the general concensus was no, however some members recommended seafoam to get some of the "gunk" out of your engine, and to relubricate seals, etc.
My oil issue since has seemed to have slowed, although it is not eliminated.
Might be worth a shot on your car as well. Other than that, I have no info, but if I figure something out, I will let you know.
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