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Old 08-26-2009, 02:47 PM   #1
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ISL engine air filter

What is the now available air filter for the 2008 Cummins ISL engine? the one in the book is no longer availble.

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Old 08-26-2009, 06:16 PM   #2
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Location: Auburn, CA, Havasu, AZ & Mulege, BCS
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Ryder Fleet Products looks like they have the AF25549 filter that's in my rig. Copy the part# & past it in their search feature. I've ordered from them before (heck, My spare might have come from them) and they were fast & professional.

Other outfits lots of folks use are rvchassisparts.com or TruckPro or Filter Barn or Truck Part City.

If you need it right away you can swing by & pick up my spare, if you'll have a new one shipped to me here in Auburn, CA

Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Old 08-27-2009, 05:59 AM   #3
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Thanks Mike, am going to Cummins today so will see if they have them. Don't need one yet but thinking of the future..
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Old 09-06-2009, 01:15 AM   #4
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Coach is three years old (New in May last year) has 10+ miles, have the replacement, wonder should I change it now before we head to east coast. Seems a waste if I have another 10K miles or so, but will carry it with us just in case. Need to do the genset oil change/filter, guess I will stop in Vegas and have them do it.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 09-06-2009, 06:20 AM   #5
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I took mine out and used and air gun and blew it out..the filter monitor didn't show that it needed changing so have resolved to finding out which one is available and It looks like the fleetgard AF25549 is the one. Good luck on the gen oil filter, they put the exhaust pipe right across the door opening for the filter on the bottom..ended up having to take the door off to get to it and the filter was so tight I ended up having it changed at Guaranty in Oregon. My next thing is to have a muffler shop re-route the exhaust pipe around the filter door. Mel
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Old 09-06-2009, 07:00 AM   #6
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Unless you are driving on gravel/dirt roads all day/everyday, I suspect these filters will last a "life-time" in an RV [before the indicator tells you to replace it]. I have changed every 30K and thats based on peace of mind, not dirt content. If it makes you feel good--do it--but dont think I'd carry a spare around.
PS--there is an alignment cone-shaped bracket at the rear of the filter compartment. Make sure the openning on your new filter matches the old filter/fits over that cone. A slightly smaller diameter openning will cause the filter not to seal and is a disaster for yr engine. [Read thread on "dusted" engines.]
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2003 40' MDTS
Garden Ridge, Texas
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Old 09-11-2009, 10:32 PM   #7
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I don't like to use air to attempt to blow out the dirt as is is just as likely to force the particles INTO the filter media. Instead I hold the filter horizontal and rap the filter end caps on the cement and dislodge any loose contaminant. You'd be surprised how much impinged dust / dirt comes out.

It then reinstall the filter rotated so that the air entering from the inlet is hitting on a different area on the filter.


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