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Replacing the oil (and filter) every 2 years as you are currently doing is not the ideal way of prelonging the IMS bearing, whether its a single row or a double row design.
In a cold damp climate like you live in and driving only on "sunny Chicago summer days" it would be beneficial and well worth the $$ to replace the oil + filter at least annually.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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