Originally Posted by LTSRAPCON
I just found this on my wifes Equinoxownersclub.com
This post was by "oldtimer"
GM has released a TSB stating that "excessively oiled" re-usable air filters can cause issues with the MAF, resulting in the service engine soon light coming on, and poor performance, including slow starts from a stop, transmission issues, and a couple of other things. The TSB instructs the techs to first look for an oiled filter if the customer presents these symptoms. If the customer DOES have an oiled filter, then any repairs are NOT covered under warranty!
This is his source doc.
Thought Ya'll might like to know.
Its not as big a deal as that TSB made it out to be. People have been using pre-oiled cotton air filters on vehicles equipped with MAFs for years without a problem.
The issue comes when people re-oil the filters during the scheduled service interval, and they use too much oil. The excess oil then gets pulled into the intake, where it clings onto the MAF sensor, rendering it innaccurate or possibly damaging it.
Bottom line is that the pre-oiled K&N filters will NOT
screw up your car. They are precisely oiled at the factory - there is no excess oil to come off and mess things up. Just be careful when you service your filter not to apply too much oil