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I've had a few K&N's in the past: if you over-oil them (dripping oil), it *could* happen, though the 928's MAF wire burn-off cycle would remediate this I'd think.
Still, dont use it: no HP benefit on the 928 and your oil will get dirtier much faster with a K&N installed over a normal filter.
Mark.
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Porsche Club Racing National Scrutineer
'89 Andial 951
'82 928R
'74 911 RSR 3.6
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