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Originally Posted by moggy 1968
unfortunately that then raises the potential for your vehicle to fail it's MOT. Even though you may achieve the required emission standards you have modified it to make emissions worse than the manufacturers standard. Depends how friendly your garage is. My understanding is this would actually, theoretically, be illegal.
But, it's a bit of a minefield!
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Yes it's a minefield but having said that there are plenty of companies in the UK who will remove your DPF, reprogramme and remap your ecu and make any sensor adjustments necessary. Euro 4 or 5 isn't an issue for them.
Unless things have changed the MOT for diesels only covers a pretty primitive smoke test?
I threw the CAT away on my wife's VW 2.5TDi years ago and have never had any issues getting it through the MOT.
Do you think it's the high sulfur content that causes an issue, or the "dirty" fuel? For example you need to use high quality, low ash, engine oil in DPF vehicles. My thoughts were that the DPF would clog if used with dirty fuel and constantly request a regen. Eventually shutting the engine down in to limp home mode. Anyway, as I say above, pretty easy (if expensive) to chuck the DPF away.
My old school, fully mechanical, MB engine seems to love high sulfur diesel. Smokes like hell but runs really smoothly
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