I'm with Hansel on looking at the forums specific to Ford diesels. That's where you need to ask a question like this.
As a former 2009 F-350 diesel owner, and knowing the '08s had more engine problems than the '09s, there is no way I would have added a chip to our 2009. The 6.4 was a nice engine for us for the 97,000 miles we had it, but it's very true on the bad fuel mileage during regenning. And also very true on expensive to repair if something major goes wrong (but that part is true with any engine that need major repairs).
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--Lynette
2019 F-350 diesel 4x4 CC LB DRW, not the mom taxi anymore...
2021 Alliance Paradigm 340RL
2016 F-350 diesel 4x4 CC LB SRW, mom taxi - sold
2014 Cougar XLite 28RDB - sold
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