Full de-mandate on a 15 litre Cummins

[Fleetman13]

(05-01-2025 )mikkhh Wrote:  How does thst "dpf keep warm" cycle affect fuel consumption and reliability?

There has to be usage of more fuel to make more heat and also to get higher coolant temperatures faster injection timing gets advanced so more heat stays in engine shortening the lifespan of oil and internals.
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It’s not constantly extra fuel…just when it’s in a regen process. If you get the vehicle under 5 mph it will kick the regen out UNLESS you enable temp stabilization in the ECM. If there is a fuel usage difference it would have to be minimal but it’s only during the regen cycle that it’s injecting extra fuel. Because the 6.7 Cummins doesn’t have a DPF injector like an ISX just has the DEF injector in the decomp tube. So it injects extra fuel on you exhaust stroke to heat up your DOC and DPF. As far as longevity on the engine the only we’ve get decal that has had the parameter set in the ECM for years and are still on the original internals with the original turbos as well. We rarely replace a whole turbo. We usually have a turbo issue after a cooler shits the bed and it flushes all the trapped soot back from the intake through the turbo causing the VGT vanes to get stuck either all the way shut or all the way open sometimes stuck in the middle