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Old 11-23-2020, 04:05 PM   #1
Ken Sair's Avatar
Join Date: Aug 2002
Location: Fulltime USA
Posts: 60
DEF Filter

2018 Aspire 44W. Its mu understanding the DEF filter needs replacing
at 2 or 3 years or 200,000 miles, depending on who you believe. Im coming up on 3 years of ownership.

Has anyone ver changed theirs and want to share a little insight? it doesnt look that difficult. Local Spartan dealer wanted one hour of service at $175 an hour. looks like about a 15 minute job. Thats not happening.

Or could someone direct me to a YouTube video somewhere. My CC will be very happy with any direction.

Thanks Ken
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Old 11-23-2020, 04:25 PM   #2
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Search def filter. I started a thread on this subject a few weeks ago. There were a couple of posts with directions or links. I've got one in my basement but am waiting to get back home to change it in case I screw up and ruin our trip ;-)
Gary and Phyllis Small
2018 Anthem 44F
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Old 11-23-2020, 04:29 PM   #3
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Here is one of the posts, there are several. The cover for the DEF filter is on the bottom of the tank, left corner. It is a hand tighten screw off black plastic cover. Your right, it's a 15 minute job including get the tools and a rag together.
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold
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Old 11-23-2020, 05:19 PM   #4
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Join Date: Aug 2002
Location: Fulltime USA
Posts: 60

Thanks. Does the filter just pull straight out with the tool? and guess I'll have to get the socket. Ill try the search feature, if I can find it.

Thanks, Ken
Ken and Ann Sair

2018 Entegra Aspire 44W .
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Old 11-23-2020, 06:20 PM   #5
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Location: Port Charlotte , Fl
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Ken, it's a simple a DIY and yes $175 is CRAZY ! I don't remember the socket size and I don't recall using the tool to pull it out just my fingers. A couple of drips of DEF R & R and done . I realize it's a 200,000 mile filter but I'm a believer that TIME ages filters ( i.e.: air filter yearly ) and the DEF filter should be changed by years not mileage in our motorhomes.
Sue & Brian Ashworth & Rizzy( adopted Boxer)
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Old 11-24-2020, 06:36 PM   #6
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I changed ours today - took ~10 minutes. The socket size is either 1 1/16" or 27mm.

The tool wouldn't work with our filter - it was in tight, and I gently removed with pliers.

I did use a very small amount of o-ring lube to (hopefully) help facilitate removal next time.

As others have stated, very easy process.

Bob Gash
Murfreesboro, TN
2017 Entegra Aspire 44B
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Old 11-24-2020, 07:10 PM   #7
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I changed mine for the first time the other day. The hardest part was getting that little filter out using the provided tool, which I threw aside and stuck my finger inside and yanked. Popped out and reinstalled the new one. Lost a couple drips of DEF. Super easy and a dealership should be ashamed of charging an hour shop rate. Next time will take about 10 minutes tops.
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