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A2 Grade Fuel Oil Specifications

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A2-grade fuel oil is the highest-grade fuel being used for agricultural and off-road vehicles. Our red diesel meets the specifications of BS 2869 A2-grade fuel oils. It can be used in untaxed vehicles and commercial and domestic machinery. You can learn more about our red diesel by reading our red diesel FAQs.

The specifications of A2 grade oils as per BS 2869 standard are given in the table below.

You can learn more about these standards in our fuel specification guide.

Parameter	Unit		Minimum		Maximum		Typical
Appearance	Clear & bright, cherry red, free from visible sediments
Ash content	% (m/m)	–		0.01		<0.01
Carbon	% (m/m)	–		–		87
Carbon residue(Ramsbottom on 10% residue)	% (m/m)	–		0.3		0.1
Cetane number	–	45		–		48
Cold filter plugging point(1) Summer	°C	–		-4		-8
Cold filter plugging point(1) Winter	°C	–		-12		-14
Copper corrosion(3 hrs at 50°C)	Class	–		1		1a
Density at 15°C	kg/m³	0.82		–		0.86
Distillation recovery at 250°C	% (v/v)	–		65		42
Distillation recovery at 350°C	% (v/v)	85		–		92
Fatty acid methyl ester (FAME)	% (v/v)	–		7		<0.1
Flashpoint (PMCC)	°C	56		–		>62
Gross specific energy (MJ/kg)	MJ/kg	–		–		45.4
Gross specific energy (MJ/litre)	MJ/litre	–		–		38.8
Hydrogen	% (m/m)	–		–		12.75
Kinematic viscosity at 40°C	mm²/s	1.5		5.5		3
Lubricity (HFRR)	µm	–		460		<460
Mean specific heat capacity over 0 – 100°C	KJ/kg °C	–		–		2.05
Nitrogen	% (m/m)	–		–		0.01 – 0.05
Oxidation stability 0.0 – 7.0% FAME	g/m³	–		25		–
Oxidation stability 2.0 – 7.0% FAME	h	20		–		–
Particulate content	mg/kg	–		24		<10
Strong acid number	mg KOH/g	–		Nil		nil
Sulphur content	% (m/m)	–		0.002		<0.098
Volume correction factor	per °C	–		–		0.00081
Water content	mg/kg	–		200		<100