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I had done some research on the life span of the bearing Porsche used. According to a "person" in a bearing company that supplied Porsche with the IMS bearings, the 6204 has a limited life span. The bearing was shipped out with 1 seal missing and no lube in the bearing, so who knows what was used as lube, and who, what, or where... they used to snap on the other seal. Also, 1 more tidbit there is a percentage of lube used to the speed limit of the bearing. Example.. if the bearing has a limiting speed of 10,000 rpm, and you are running it at 7,500 rpm, then you fill the bearing between 33% to 50%. If you are running the bearing at 2,500 rpm, then you fill the bearing 50% to 66%.
Porsche should of left the bearing filling, and seal installation to the bearing to the mfg. and this would probably be a non issue. This research was done on the double row bearing used to '99, and if the bearing, was filled correctly, and not damaged on intallation, or overrev'd etc. should of lasted into 100k's with no problems. OH, and as soon as I mentioned "Porsche" the "person" shut up and would not give me anymore info.
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