Do petroleum products like petrol and diesel have a shelf-life?
Both petrol and diesel can expire even under the best conditions, but there are ways of treating fuel to be able to store it for longer.
Asked by: Rod Heap, Upminster
Petrol goes ‘stale’ more quickly than diesel – impurities and condensation in the tank can cause the fuel to go slimy if you leave it for more than a couple of months. But because diesel is less refined and more oily, it can last quite happily for a couple of years. Chemical stabilisers are available for helping preserve fuel if you’re storing your car or lawnmower for long periods.