Classic Valvemaster

■ £12.95 to treat 250ml ■ wemoto.com ■ Easy-to-measure container ■ More expense

The classic world has to get used to petrol that is potentially harmful to our vehicles. This additive from Castrol Classic Oils aims to help on two levels. Firstly, it is a lead replacement, using a phosphorus-based formulation to protect valve seats. Secondly, it has a stabiliser that helps prevent the ethanol in the petrol attracting moisture (water) from the air, rotting tanks, and creating an acidic-rich mixture. It’s also said to improve performance.

I haven’t tested it – it’s almost impossible to – but ally this with always using super unleaded and you are looking after your bike as well as you can. For bikes with more than 8.1:1 compression, there is Valvemaster plus; 250ml treats 250 litres, so it shouldn’t cost the earth.