Having read lots of post on this topic here and elsewhere, I think I have the answer. I bought my car Oct 2014 with unevenly worn bridgestone turanza run flat tyres. Unmatched because they were well worn but one had been replaced following damage. The car was awful pulling away up a slope or pulling hard at slow speed. So I've been driving gently. I did not want to damage the transfer box, which is apparently responsible for the hesitant drive at slow speed, the car was producing. I've now replaced the whole set of tyres with the only make I could find at any sort of sensible price Dunlop Sport sp1's (r18's, Opoeno £448 plus fitting £48, Asda £505 inc fitting) Problem of drive quality solved, plus the ride over our country road potholes is much less harsh ( non runflats- well the car has a perfectly good spare). BMW recommend only pirelli and dunlop according to my local agent(Ocean). The reason is only the recommended makes have the same rolling circumference of front and back wheels, when the tyres are mounted on the wheels, on the car. The same theoretically correct size tyres from other makes do not necessarily actually have this consistency of circumference. Hence the chuntering of the transfer box. Some people seem to get away with non recommended makes. They may be being lucky, they may not be hearing of feelinging the transfer box clunking away under the car. The test is to take a front wheel off and a rear wheel and stand them on a flat surface side by side.They should, and they need, to be, a perfect match otherwise the transfer box has to work to correct the variation. Inevitably wearing its components.(expensive item to replace). I will now replace the transfer box oil, fresh oils got to be better than old. Bmw say it doesn't need doing but apparently it comes out dark brown and dirty looking. It's 75w90 polyester oil takes abt 700ml, I'm going to use the one recommended by Motul (£14.00 ebay)
jerky transmission at slow speed 2007 2.0 d msport
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