Posted by Sprint 6 on January 20, 2020 at 08:52:17 from (107.77.208.12):
In Reply to: Def system question posted by rrman61 on January 20, 2020 at 07:48:59:
A customer of mine says he doesn't even notice when his Case backhoe regens. You do need to let it tell you it need DEF, though. Since DEF freezes at about 20°F, there is not a traditional floating level sensor in the tank. It uses an electronic conductivity sensor to sense level at three points in the tank. The computer needs to see the level dropping past at least one of those sensors as the DEF is used. If you continually keep the DEF topped up, it can trigger a code and idle the machine because the computer assumes that the sensors are giving a false full message.
The other thing about DEF systems is they tailor to the way the machine is used. Your DEF usage can differ from the same machine with a different operator.
DEF also breaks down in sunlight, so don't buy DEF in translucent jugs and don't leave it outside.
All in all, it's not that big a deal to deal with and you probably won't use as much as you think. My 6.7 Powerstroke customers only use about 5gal on a 7500 mile oil change.
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