I have done over 1,000 on my cars new engine, today i was at shell and though i will give it a tank of optimax and see if it improves the cars running,


Well what a bad idea that was.... It now seems to have speed the idle timing up and its running a little lumpy now also on tickover you can smell the petrol if you stand near the rear of the car.

Is this because of the optimax? should i be using a led additive for the petrol?