http://www.car4play.com/forum Car4play forum en-gb Sat, 20 Jun 2026 22:41:55 +0100 Copyright: Car4play webmaster@car4play.com (Technical) 5 car4play689784 Sat, 20 Jun 2026 22:41:55 +0100 I put £20 of E5 in the Herald in late October. I got about one mile towards a show I was looking forward to when she started misfiring badly. I managed to struggle home, mostly in second with high revs. The following week I syphoned the tank and put E10 in. It seems the damage was done. Only just put her back on the road. My, and other people's, theory is that not enough drivers use E5 to require the filling station to refresh it's tank regularly and are therefore selling 'bad' fuel. May be common in rural areas. I won't be using it again, it will be easier to just replace the Stromberg diaphragm or the small sections of rubber in the pipeline if needed. Ted http://www.car4play.com/forum/post/index.htm?m=689784&v=e car4play689781 Sat, 20 Jun 2026 18:51:54 +0100 There is that. And rotting your carb diaphragms. And avoiding GL-5 gear oil because it dissolves bits of your gearbox. A minefield. http://www.car4play.com/forum/post/index.htm?m=689781&v=e car4play689780 Sat, 20 Jun 2026 17:45:42 +0100 I don't think it would make much difference to a 2003 car. But we're advised to put E5 in 20th-century cars to avoid degrading the fuel pipework ? http://www.car4play.com/forum/post/index.htm?m=689780&v=e car4play689778 Sat, 20 Jun 2026 17:13:53 +0100 Hard to say! The engine probably isn't the critical component in it lasting another 23 years. But I always think they go better with E5/Super+. And when you have washed them. http://www.car4play.com/forum/post/index.htm?m=689778&v=e car4play689776 Sat, 20 Jun 2026 16:47:15 +0100 Thought I’d treat my 23 year old Focus to some E 5 petrol for Father’s Day . Have I wasted my money? http://www.car4play.com/forum/post/index.htm?m=689776&v=e