1.7. The definition of‘ Permitted Fuel’ is as follows:
NOTE: The ASN reserves the right to amend these details to reflect any change occurring in the quality of fuel on general sale to the public in the UK.
Also refer to Specifications Table below. Petrol: Commercially available gasoline
a. BS EN 228( unleaded and super-unleaded).
Unless otherwise stated or the distinction is made between leaded and unleaded petrol, the motor gasoline fuel shall meet the following:
i.
ii.
Acceptance levels for Octane Numbers will be accepted or rejected according to the Standard ASTM D. 3244. Only additives to this Motor Gasoline Fuel solely for the purpose of lead replacement are allowed.
LRG( unleaded), Lead replacement gasoline( LRG also known as LRP): Only additives to unleaded motor gasoline, solely for the purpose of lead replacement, from Sodium, Phosphorous or Manganese are allowed, subject to application according to manufacturer’ s instructions and to the treated fuel complying with the Specifications Table at Art. 1.8 of this Chapter.
Lead in excess of EU Directive 98 / 70 EC requirements is illegal. This also applies to‘ Free Fuel’.
The addition of a lubricant on current sale is permitted in fuels for use in 2-stroke engines.
For rotary engines, a 2-stroke oil with a minimum viscosity of 5 cSt at 100 ° C, may be added at a maximum concentration of 0.30 %( mixing ratio of 300:1). b.
c.
d.
e.
f. g.
h.
Petrol or Diesel in compliance with FIA Appendix J Art 266. Or, for Karting, Petrol in accordance with CIK Technical Regulations Appendix 6. Article 6.1.
LPG( Liquefied Petroleum Gas) which is of 99 % wt. min. hydrocarbon composition and that is entirely gaseous at atmospheric temperature and pressure. Complying with BS EN589.
Diesel Automotive Gas Oil( DERV), commercially available, complying with BS EN 590 and EU Directive 98 / 70 EC( see Table below).
High Ethanol Content Fuel in compliance with FIA Appendix J Art 266 Article 9.3 – Only permitted to be used with the specific approval of the ASN.
Bio Diesel – Commercially available and complying with BS EN15940
Methanol. Methyl Alcohol CH3OH. This is a clear colourless liquid, miscible with water acetone and other ketones, the esters, aromatic and highly unsaturates hydrocarbons, and castor oil. It is not miscible in all proportions with straight-run petroleum spirit or mineral oil. B. P. 64.7 ° C, Specific Gravity 0.796, Flash Point 32 ° F. For Speed Events, British Standard 506 with an allowance of up to 10 % Acetone, is permitted. It must include an ASN approved additive which provides a distinguishable colour and smell when burning. The maximum permitted volume of additive within the fuel is 0.2 %.
Hydrogen in compliance with FIA Appendix J Art 266 Article 9 – Only permitted to be used with the specific approval of the ASN.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 8 Appendix 1- Permitted Fuels 323