This was an interesting thread on HDRams forum. There's been quite a discussion on the accuracy (or not) of the DPF gauges on the RAMs but I found this thread (starting at post #168 currently on page 9) to be very interesting about how DPF works by direct injection of fuel through the exhaust valve, fuel dilution of engine oil and relationship to type of driving, and 2022 chip shortages in which RAM received a waiver to sell trucks without a DPF sensor - recall pending.

https://hdrams.com/forum/index.php?t...-9#post-239322