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Castrol has developed an emergency fuel which is safer to carry around than a
can of petrol but will start and run a car in an emergency (GB 2352451). The
fuel comes in two components. The main one is a mixture of 70 per cent paraffin
and 30 per cent naphthane, which has a much higher flashpoint than petrol. On
its own, this cannot start an engine, but when mixed with a small amount of
butyl peroxide it can start an engine from cold. Castrol tested the idea with a
1997 Buick Riviera, draining the tank and engine dry, letting the engine go
cold, and adding a gallon of the emergency mix. The engine obediently sprang to
life.