Has anyone else had any problems using Shell Fuelsave?
I've a Mk5 2.0L Turbo SXI, 78k miles and it's always run perfectly. I've just filled up with two full tanks in succession of Shell Fuelsave. It seemed OK on the first tank, but on the second it felt rougher and I had a strange sound at part throttle and low revs from the engine particularly in 5th and 6th. Sort of a cross between a whine and pinking. I've just filled up again but with cheap Asda juice, and the car is now back to normal, smooth and no noises.
Is this just a bad one off fill or is it the new petrol?
Shell is the closest to me so tend to use it a lot, but I'm a bit reluctant to do so now.
Am I worrying over nothing?