i filled up the 5 with bp ultimate from my local garage the day , and when i put my 5 on the rollers it was det'n really bad , i hadnt changed anything on the car, so the only thing it could be was the fuel drained the tank and filled up with v-max and problem was sorted , im almost 99% sure its only unleaded i filled up with at my local garage from the ultimate pump
thing is i fill up my clio every week from the same garage , thats sum skin the garage is making if its just regular unleaded ,im contacting trading standards and my local paper ,im fuming , i went back to the garage and spoke with the manager on my way home , hes got my name and number and said he would get back to me .