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What can you add to diesel fuel to prevent it from becoming less effective at low temperatures?

Vehicle Condition
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Anti-freeze
Petrol
Paraffin
Anti-waxing additives
← You discover that one of your rear brake-light bulbs has failed. How soon should it be replaced? You're about to start a long journey midway through the day. What should you do if you notice that the sidelights work but the headlights are faulty? →

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