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I was trying to troubleshoot a problem with my 5-series BMW when I stumbled across a thread on BimmerForums discussing the possibility that oiled air filters (like K&N) may possibly coat the Mass Air Flow sensor resulting in poor performance. My question is...has anyone ever heard this before? On my 540i, the MAF sensor is directly behind the air filter, so I can see how this may be true. How far upstream is the MAF on the Maser's 4.2L engine? Thoughts?
 

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Too much oil?

...oiled air filters (like K&N) may possibly coat the Mass Air Flow sensor resulting in poor performance. My question is...has anyone ever heard this before?
I have not used oiled filters for fear of the issue above. My understanding however is that although a real problem, it is avoidable by applying only a very thin coating of oil. It seems that many will over oil the filter with the excess making its way to to the sensor. Truly a case of "less is more" Like the old commercial says, "a little dab will do you!"
 

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There is a neat trick...

I take 50-1 Premix and use it to clean and oil the filter... It get's out the dirt, and leaves a very thing coat of oil on the filter... Some people think that's crazy but it's been working for me on these kinds of filters since 1975, on Car's, Motorcycles, etc.
 

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If you over apply oil, it's going to be a problem on any car... it doesn't mean that you shouldn't use oiled filters, just don't over apply the oil.

Our filters come pre-oiled so that you can see how much to use. It's really not much and is usually best applied with a cloth to help spread it around and massage it in a bit.

Best Regards,
-- Jeff
 

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I didn't even know there was oil on the BMC filter...
 

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Being Italian, it's probably olive oil
But is it virgin olive oil?

The oil problem is very real and it won't matter how far the MAF is from the filter. We are talking substantial air flow here.

I am not aware that BMC's have oil on them. Mine did not.

I know that BMC does make a wash kit available but I am unaware that it's an oil bath.

However, I do stand to be corrected and certainly Jeff would know at least concerning those for Maserati.
 

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I was trying to troubleshoot a problem with my 5-series BMW when I stumbled across a thread on BimmerForums discussing the possibility that oiled air filters (like K&N) may possibly coat the Mass Air Flow sensor resulting in poor performance. My question is...has anyone ever heard this before? On my 540i, the MAF sensor is directly behind the air filter, so I can see how this may be true.
This was a big problem for me on the Jaguars and on the Range Rover. I used Radio Shack electrical contact cleaner. Other posts claim that you can also use brake cleaner. When I reoil my filters now, I free fall drop about a foot directly on newspaper a few times to ensure that the filter isn't over oiled (under the premise that excess oil will shake out).
 

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A sponge helps also. Just put some filter oil in a catch pan or something and dab it on... really it's not much. As others have also said, less is more. Just think about whats happening. We're not lubricating anything with the oil. It just helps trap dirt.

Best Regards,
-- Jeff
 
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