Forum Discussion
Dakzuki
Aug 12, 2013Explorer II
9er wrote:Dakzuki wrote:rvsolutions wrote:
We have around 4500 miles on our Winnebago Via. The service manager at the Mercedes dealer in Shreveport told us not to let the def get low enough to trigger the warning so I grabbed a 2 1/2 Gal jug at Wal Mart and topped it off yesterday, took all but a little bit at the bottom of the jug. Any thoughts on whether this a normal amount to burn through?
We picked up the coach at Lichstinn and drove it back to Southern Calif. This our 5th motor home and downsizing to the Sprinter chassis was the best move we have ever made. Great coach, looking forward to many miles!
...and just what is the reason he thinks you shouldn't let it get low enough to trigger the light? The only reason I can think of is you will have a limited amount of engine start cycles once the light comes on. Once you reload with DEF you are good to go.
DEF "range" depends how big your DEF tank is. Sprinters can have a big or small tank. I don't know about the Via but on a Cab chassis the big tank is filled from the side of the RV near the house door behind a bin door and the small one from under the hood. I have the "big" tank on mine and I had the light come on at about 9000 miles. The smaller tank which many newer ones have won't go so far. The smaller tank is actually better for RVs as they don't rack up miles so fast. The big tank is more in line with what a fleet vehicle should have. DEF can get old so I don't even fill mine all the way anyway.
yea what is the reason?never heard that before
For those that want to know more about the DEF thing here it is:
My owner's manual says that when you have about 1000 miles left on your DEF supply the dash light illuminates. Once you run out, you get a tone nagging you along with the light. At that point you have 20 start cycles until the engine will refuse to start until you reload DEF. In any world that is ample warning. DEF is easy to find (cheapest at truck stops) and lasts a loooooong time.
End of lesson.
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