I recently had my vacuum diaphragm go allowing oil to be drawn into the air cleaner housing.I have had a K&N filter in it for almost 2 years and it got soaked with motor oil.I tried cleaning it with the K&N filter cleaner (twice)and it kept weeping motor oil out so I bought an MB filter to 'get by' while I try to clean the K&N again.The MB filter was $7 cheaper than aftermarket and my fuel economy went from 32 mpg to 34 mpg.That was only one tankful but I always got 32 mpg before,it makes me wonder about K&N's claims.

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