Fuel additives
Do fuel additives add up?
Fuel additives may sound tempting, but do they really work? Which? put a selection of 'miracle' car fuel boosters for both petrol and diesel engines to the test to see whether their claims can be justified.
In our full report you can see...
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Verdict on fuel additives
Fuel additives claiming to increase your car's power or fuel economy sound tempting - but can they live up to the hype? Which? finds out.
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Petrol fuel additives compared
Find out how five petrol fuel additives - from brands such as Redex and STP - performed in our lab tests, and whether they're worth the money.
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Diesel fuel additives compared
Our lab tests the claims made for four diesel fuel additives - from Millers, PD-5, Redex and Wynn's. Which - if any - are cost effective?
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