Assertion: tiller motor | /r/CapableOf | use petrol
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text: This is usually done with an electrical heater, but some tractors motors designed for cold climates in the mid 20th century could use either fuel, and had to be started using petrol, then when hot, the driver could choose to use either expensive gasoline or cheap 'tractor vaporizing oil' which was in some European countries was subsidised and stained to detect its use in 'unauthorized' vehicles.