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I have just removed the paper filter to replace with K&N but the old one had a deposit of what looks like grease! Where is it from and why/what is it?
 

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Sadly Woolly has passed away
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Possibly someone had an oiled filter in there before. They are not good for modern engines (MAF problems, poorer filtration etc. etc. ) which is why MB and most other manufacturers use paper filters.
 
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