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Old 12-20-2012, 10:05 AM
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DEF questions...?

I'm a 6.4 guy that's tuned and deleted. My dad has an 11 6.7. This morning he called me because his check engine light came on. He seems to think his def froze in the lines. We live in Colorado, last nigh it got down to about 10*. Wondering if anyone in some of the colder states is having any issues with this and if what you guys are doing to stop it. I'm trying to convince him to just tune and delete it, but he doesn't want to have switch the systems when it comes time for emmissions. Any help or suggestions would be greatly appreciated. And also some reasons why he should suck it up and tune and delete also other then just hearing it from me.
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Old 12-20-2012, 11:20 AM
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Haven't had my DEF freeze at all and I've had my truck everywhere from Ontario to the mountains of NY in the winter.

Why to tune/delete
-remove the chance of fuel getting in your oil
-reduce EGT's (high EGT's are a killer of Diesel engines)
-improve fuel mileage
-remove soot from intake tract by turning off EGR
-added horsepower
-lengthen life of motor by letting it breath easier
-FUN
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Old 12-20-2012, 12:38 PM
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Thanks for the info! Those are all the same reasons I gave him as to why to tune and delete. As I said before I have a 6.4 tuned and deleted and couldn't be happier with it now.
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Old 12-20-2012, 04:46 PM
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Im in the Springs and work out at Schriever AFB. When I left work last night it was 4 degees and I had no issues with DEF freezing. As for emissions, you guys could always move to El Paso county...no emissions here!
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Old 12-20-2012, 05:01 PM
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I think the freezing point of the DEF is about 12 degrees and the tank and lines
are also heated.
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Old 12-20-2012, 05:08 PM
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It freezes at 12 and it doesn't matter.
The truck will run just fine with out it, until the heater can unthaw the tank and lines.

What you do need to be careful about is the Fill Tube. It is not heated and the expansion from the DEF freezing can crack the tube. So make sure you don't Over fill your tank in the winter months. It's why the Ford DEF bottles have the seal and breather tube so you don't overfill.
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