From what I understand there are a couple different ways they do the regen. The most common, and I think the cheapest, is injecting extra fuel in the engine on the exhaust stroke. This adds fuel to the oil. Dodge/Cummins, GM and Ford are set up this way now. Supposedly some of them are changing designs in the future to a better but more expensive setup. There are several options including post engine fuel induction, electrical heating of the DPF ect. I think the higher the operating exhaust temps are the less the regen process needs to run (higher temps help burn off the carbon). Therefore the more you idle, city drive or baby the engine the more often it will need to regen. No matter what way you go the regen will use extra fuel (even the electrical takes fuel). The ash is what clogs the filters over time which is why the CJ oils are needed as they are a lower ash content oil than the pre-2007 CI oils. Sulfur also goofs up the regen process which is why they've gone to low sulfur fuels for on-road. Now with off-road engines with DPF's they'll need low sulfur fuel too.
When these modern tractors are "antiques" they will be really hard to work on.
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