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18 Posts
Agreed, DEF is a complete PITA plus it can be pricey.Just finished a 800 mile round trip up through AL and TN...After I cleared that initial CEL it hasn't come back thankfully. The truck ran beautifully on this trip, averaged out to 29mpg overall, including some cruising around downtown Nashville for a couple hours. Everything about the way the truck drives is better, except the DEF usage, that seems to be quite a bit more now which I wasn't ready for. Over about 1k miles I went through a full quarter of a tank of DEF, and that's with no towing. Prior to the tune my truck had used ¾ of a tank over 6k miles, 800 of those miles was towing a 6k lb pontoon boat on the freeway which had it using much more DEF than normal. Its probably worth it still with the extra DEF usage, but its unfortunate as I hate having to use the stuff, I guess we can thank the EPA idiots for that one.
On the topic, is there a preferred DEF we should be using or is the AutoZone $12.00 stuff acceptable. I also have BlueDEF Platinum in my garage but haven’t used it yet. Most of the reviews on the cheaper stuff seem good. I asked GDE about this and they had no idea.
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