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Is there a real significant difference between the green, red and OEM air filters? Just wondering if the cost is worth it. Hope this is not stupid...

JOEVEE
 

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Administrator 2009 SLK 55 AMG/Founding member 2006
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No question is stupid. (well most arent't :D)
price and quality is the determining factor
greens usually don't have oil and can be cleaned and reused
bad filters can disintegrate and ruin your MAF
oem is what mb wants you to use so you give them money
Then you have the expensive but very well made and recommended filters
High Performance Air Filters | BMC AIR FILTERS
K & N have oil and some don't recommend them and some swear by them.
remember to use our search feature
 

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A poor/cheap filter will catch up with you later on.
You must decide if you want your air filter to have a flow bias or ability to trap dirt. There is a trade off between one and the other. Usually for a daily driver, you will want to trap dirt - then look for the micron rating - you want one that will let in minimal particles.
What environment do you live/drive in? If dusty, then an oil impregnated one replaced often is best. If you know the environment to be pure or you are racing, then the dry green filters might be favoured.
If you really want to select the correct filter, then look at their ISO 5011 test results - this will show all sorts of things like the micron rating, flow restrictions at various dirt capacities etc. Compare the findings and you will immediately see the better filters. Do not po-poo OEM filters though...
 

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After trying many different types of 'performance' air filters on several different cars over the years, my personal opinion is to buy OEM paper filters in bulk and swap them over regularly.

This will give you a good compromise between maximising air flow and keeping your engine protected. There is no 'magic bullet' filter at any price that will flow substantially more air than a clean, well constructed paper filter.

Cheers,
Brian
 
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