Report E10 petrol on crossflow? in OLD SKOOL FORD CHAT Posted September 1, 2021 Morning all. I have a 1.6 crossflow engine installed in a boat. I have no idea if it was ever converted to run on unleaded so I always add some lead replacement when filling up. The new E10 petrol is now being rolled out and the research I've done so far shows that it can knacker rubber seals in older vehicles, especially if left for long periods. Does anyone know if crossflows can run on E10?