Revision question · Vehicle condition

If approved by the engine and fuel supplier, which type of additive can improve diesel’s cold-flow performance?

Revision material from the imported DVSA bank includes source-checked Lanekind learning corrections. These corrections are not newly issued official examination questions, and practice does not reproduce a live test paper.

Answer options

Anti-freeze

Anti-waxing additives

Petrol

Paraffin

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Anti-waxing additivesThis was the right answer

Approved cold-flow or anti-waxing additives can help control wax crystals; winter-grade fuel may already contain them. Follow the fuel and engine specifications. Waxing is not water freezing, and petrol, coolant or paraffin must not be improvised as additives.

Reviewed reading for this question

Understand diesel waxing and approved cold-weather measuresReviewed guidance summary · The correction distinguishes wax crystals from water freezing and forbids unapproved additives.

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