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I went from an E46 touring 320d to a E91 M57 6 cylinder, and to be honest my running costs have not really gone up at all. The tax was the same due to newer engine and the insurance pretty much remained the same. I am and old fart tho in my 40's lol. I guess some parts such as smaller brake discs etc may be a little cheaper, but not enough to make down grading to a 4 pot worthwhile. Fuel economy is the same as my E46 too. With the exception of sitting in a que of traffic, I guess the 4 pot would be better here.
I would never go back to a 4 pot diesel. Maybe a turbo 4 pot petrol.
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