I'm new to dodge cummins and just picked up a 99. While going through the engine I noticed the air filter was very dirty, under the paper filter was a blue foam piece about 2 inches thick and seemed to be slightly oiled. Is this a stock piece? I checked out new air filters at the parts store and the blue foam is not included, do I have to run both the paper filter and foam. If not what replacement filters should I run?? Mopar only, or are the STP filters from Autozone fine to use.<br><br>thanks in advance.<br>jerry

 

The foam is just a pre-filter that is stuck onto the stock air filter. Basically it just keeps the larger particles from getting down into the pleats.<br><br>Any new filter should be OK, even if it doesn't have a pre-filter. The prefilter is just added piece of mind.

 

u can clean the foam and reoil it and put it back with a new filter if u like.

 

thanks for the prompt responses. I'll do just that.<br><br>jerry