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Dual rows of bearing means twice the load bearing area and half the load on the bearing balls so if nothing else logic would dictate that in theory they should last longer.
I think keeping the bearings lubricated is the key to the matter so the seal on the bearings is probably the key.
Where is Jake, it would be interesting to hear how many dual row IMS failures he has had to deal with compared to the single row variety.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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Dangermobile
Hybrid Mode
