I've had my 2007 mini cooper s for two weeks. On first filling (from the non BMW dealership I purchased the car from) a mile on (from purchase gave enough petrol to get down the road to fill up
) the car was fine.
I drove the car from Buckinghamshire to Newport, S Wales. On the second petrol filling, on starting the car, the car juddered, almost shaking and as if it was struggling to keep going (still parked on the forecourt, not being driven) and practically to the point of nearly cutting out.
On the third filling the car did not experience the juddering but more of slight tremble.
The car came with a modification - timing chain tensioner, and I'm mentioning it in case this may be a relevant cause or not.
I was told by the dealership I purchased the car from that the car has superunleaded. On leaving the dealership, the petrol station down the road only had unleaded as the superunleaded was capped off.
I have also found the local petrol stations have capped off their superunleaded. I've filled the car up (though not fully on the last three occasions with unleaded as I've been unable to source superunleaded.
Is anyone able to advise please?