26-02-2019, 06:01 PM
I just fill up with 95 octane at petrol stations, not supermarkets, and have not experienced any problems although my cars don't have any non metallic pipes. I went for a 40 mile run today in a car which had 6 month old petrol, it started and ran OK, until the ignition lead fell out of the ignition switch terminal, fixed in two minutes.