Oil On Air Filter

[MrAnderson]

I bought my truck with an aftermarket air box and swapped it out with a Banks air box.

My new filter has a pre-filter on it, but it's never oily when I pull it out and it's been on for over 30k miles now.

With the volume of air diesels pull in I wouldn't think any oil would go back up the air hoses like a naturally aspirated gas engine can.

I'd be inclined to think it must be the oils on the road being picked up.

When the tar heats up, there's a little bit of oil that can come out when it's squeezed, like when our heavy trucks drive over them but that sure seems like a lot.

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[cosmicIPA]

Kind of off topic but I always wondered how the stock cold air box can sense when the outside fresh air from the front of the truck is a good weather day and switch to the fender well intake on bad weather days.

There’s mass air and intake temp sensors so how does it tell when it's raining out?

Ha.


2013 3500 6.7 Cummins Crew Cab Stock

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[toyota_mdt_tech]

Mine has always looked like that; well, not as bad as I change mine every 10K miles, but it has had a little oil on it since new.

I bought it new too.

I would worry much, but I'd sure tighten the service intervals on that by a bunch.

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[f18framer]

I deleted the CCV filter and put a Mishimoto catch can on mine.

That thing catches all kinds of oil.

It is still routed to the intake and goes through the catchcan first.

I like the idea of a bit of vacuume helping evacuate their gasses.

Before, I thought I had a rear main seal leak because it was seeping out of the trans housing.

It was not enough to put a spot on the driveway, but it was always moist.

Since I did the delete, it has completely dried up.

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