As part of the government’s drive to reduce pollution E10 petrol was introduced in the summer of 2021. It was said that E10 fuel was more eco-friendly burning less and generating lower emissions.
The Department for Transport has said that all petrol engine vehicles built since 2011, and many of the cars made after the late 1990s are E10 compatible. However, if you own an older or classic car you should not fill up with E10 fuel as you may then have problems. E10 petrol contains up to 10% of renewable ethanol which is corrosive to the metal, plastic and rubber in a car’s fuel system. This will affect fuel lines and carburettors.
Before you panic, it ought not be a big issue If you should do this just once by accident, as it probably would not be sitting in the tank for too long.
Also worthy of consideration is that the ethanol in E10 petrol absorbs water. If you should leave your older car idle for long periods of time, or if you put your classic car away for the winter or in storage to protect it, this water absorption can be a serious issue. The longer you leave it the more the moisture will build up and that could diminish its driving capabilities and safety.
You can still find the old E5 “super” grade petrol, although it may be less available in more rural areas. So, it may be wise to fill up regularly when you find it.
If you have a modern classic car built from the late 90s onwards, you’re probably OK using E10, but if you are concerned about your car’s compatibility, err on the side of caution and check the Government’s on-line tool.