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Just to clarify, several of the IMSB retrofit products have one of the seals removed.The bearings may be deep-groove ball, ceramic or roller but the 0ne-seal-removed feature is a common factor when relying on splash or DOF lubrication.
The sealed+greased bearing option - seal venting applies to upgraded retrofit bearings with ultra high temperature rated seals(Viton) and packed with very high temperature grease. Presumably the very small(?)vent is opened at the top of the seals only. Just google SKF 6204C3 GJN 2RS.
Not a recommendation just a report of Forum discussion.
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2001 Boxster S
Engineers muse
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