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Old 05-01-2016, 08:48 AM   #1
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Draining DEF tank?

I was just reviewing my Spartan Training manual and I noticed they suggest that the DEF tank be drained after/during storage annually and refilled for the new season. I run mine down low but have not been draining.I am just wondering for those who store their coaches for winter are you doing this? Is there a drain plug or are you siphoning?
2017 Entegra Coach Anthem 44B/450 Cummins/Spartan
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Old 05-01-2016, 09:48 AM   #2
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I just let mine get as low as possible before storage and ad new DEF when getting ready to leave. So far it has worked for 2 seasons.
Chuck in SW FL
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Old 05-01-2016, 09:49 AM   #3
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I did not drain mine on the Aspire nor do I on the new rig. Never an issue. My longest period of storage is probably 4 months.
Stew and Diane (and Marco)
2018 Entegra Cornerstone 45X
Formerly: 2015 Entegra Cornerstone 45B, 2013 Entegra Aspire DEQ IFS, 2004 DSDP; all sold
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Old 05-01-2016, 09:54 AM   #4
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I think if you are goining to drain it you will be better served to repace the filter. It comes with a tool or you can use a socket. Mine was really dirty at 20,000 miles or so. It is located at the lower rear of the tank.
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Old 05-01-2016, 10:28 AM   #5
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Originally Posted by Marcosdad View Post
I did not drain mine on the Aspire nor do I on the new rig. Never an issue. My longest period of storage is probably 4 months.
What Stew said. Mine has set all Winter and never had a problem. Noel
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Old 05-01-2016, 01:19 PM   #6
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Fill it full, to minimize air in the tank that causes crusting due to evaporation. Just what I have done for two (2) years = no problems at this time.
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Old 05-02-2016, 10:09 AM   #7
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DEF doesn't go bad that fast. I'd prefer to keep it full it prevent crystallization. Winter isn't that long - even in Wisconsin.
Mark & Leann Quasius
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