They might turn off/block egr which reintroduces exhaust gasses to intake to reduce combustion temperature. The upside of this system is that it reduces NOx emissions, the downside is that you’re bringing a lot of soot inside the engine. They are abrasive.
Combine egr with pcv, which directs positive crankcase pressure into the intake, you get an oily sooty mixture caking inside the intake.
Combine this with swirl flaps, which create a small tornado at lower engine speeds for better combustion, you get caking on the flaps and your intake becomes halfway clogged.
These are my annoyances. But to be honest, it didn’t require cleaning even after 250.000 kilometers of driving. I saw the caking while doing some other work, but the engine was running fine
But there’s also the dpf, and the adblue stuff. Dpf is an issue only if you use wrong kind of oil and clog it. I’m assuming people remove the dpf to run coal, as it will get clogged extremely fast if you detune your engine. It might also be an annoyance if you want to mod the engine, but not sure on that front. And adblue is yet another thing to fill every now and then. No experience with that, but I assume it might annoy some.
When you start "rolling coal" all the "gains" by removing the EGR and PCV will be negated since you will be lining your valves with tar and ruining the oil.
Combine egr with pcv, which directs positive crankcase pressure into the intake, you get an oily sooty mixture caking inside the intake.
Combine this with swirl flaps, which create a small tornado at lower engine speeds for better combustion, you get caking on the flaps and your intake becomes halfway clogged.
These are my annoyances. But to be honest, it didn’t require cleaning even after 250.000 kilometers of driving. I saw the caking while doing some other work, but the engine was running fine
But there’s also the dpf, and the adblue stuff. Dpf is an issue only if you use wrong kind of oil and clog it. I’m assuming people remove the dpf to run coal, as it will get clogged extremely fast if you detune your engine. It might also be an annoyance if you want to mod the engine, but not sure on that front. And adblue is yet another thing to fill every now and then. No experience with that, but I assume it might annoy some.