Fuel Types & Quality
Premium Diesel
What is premium diesel?
CheckFuelPrices Editorial
Expert Written • 3 industry sources
Premium diesel is an enhanced grade of diesel fuel that contains a higher concentration of cleaning additives and performance-boosting compounds than standard diesel. It is sold by branded stations under names such as Shell V-Power Diesel, BP Ultimate Diesel, and Esso Synergy Supreme+ Diesel, and typically costs 10–15p per litre more than standard diesel.
What Makes Premium Diesel Different
Enhanced additive package:
Premium diesel contains higher concentrations of detergents and dispersants that clean fuel injectors and combustion chambers over time. Standard diesel only meets the minimum additive requirement set by UK and European fuel quality regulations.
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Higher cetane number:
Premium diesel typically has a higher cetane rating than the standard minimum of 51, which means it ignites more readily and can produce smoother, quieter combustion.
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Friction modifiers:
Many premium diesels include friction-reducing compounds designed to protect fuel system components and improve overall engine efficiency.
Claimed Benefits
Improved fuel economy:
Manufacturers claim modest fuel economy gains of 1–3%, though real-world results vary considerably by vehicle type, driving style, and engine condition.
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Engine cleaning over time:
The detergent additives can gradually remove existing deposits from injectors, which may restore lost performance in older or high-mileage diesel engines.
Reduced emissions:
Cleaner combustion from a well-maintained injector system can lower particulate and NOx emissions slightly, though the difference is marginal on modern engines with advanced emissions systems.
Is Premium Diesel Worth the Extra Cost?
Modest real-world gains:
For most everyday diesel drivers, the fuel economy improvement rarely offsets the 10–15p per litre price premium, particularly on short urban journeys.
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More relevant for high-mileage drivers:
Drivers covering high annual mileages in diesel vehicles, particularly on motorways, are more likely to see a measurable benefit from the higher cetane rating and injector-cleaning properties.
Check the price gap first:
The value of premium diesel depends heavily on how much more it costs at your local station. CheckFuelPrices shows live prices for both standard and premium diesel so you can judge the gap before you fill up.
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Sources
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