Bestchem Toluene (Methyl Benzene) for Octane Improvement
Bestchem Toluene (Methyl Benzene) for Octane Improvement
Bestchem Toluene (Methyl Benzene) for Octane Improvement

Bestchem Toluene (Methyl Benzene) for Octane Improvement

Regular price $49.05 Sale

Note: SCDF P&FM storage licence is required if the quantity purchased, stored or kept exceed the licence exemption quantity (i.e. 20 litres for most P&FM).


Bestchem Toluene is a pure hydrocarbon (C7H8). i.e. it contains only hydrogen and carbon atoms. It belongs to a particular category of hydrocarbons called aromatic hydrocarbons. Complete combustion of toluene yields CO2 and H2O. This fact ensures that the entire emission control system such as the catalyst and oxygen sensor of your car is unaffected. There are no metallic compounds (lead, magnesium etc), no nitro compounds and no oxygen atoms in Bestchem Toluene. It is made up of exactly the same ingredients as ordinary gasoline. In fact it is one of the main ingredients of gasoline.

Bestchem Toluene has a RON octane rating of 121 and a MON rating of 107, leading to a (R+M)/2 rating of 114. (R+M)/2 is how ordinary fuels are rated in the US. Note that Bestchem Toluene has a sensitivity rating of 121-107=14. This compares favourably with alcohols, which have sensitivities in the 20-30 range. The more sensitive a fuel is the more its performance degrades under load. Bestchem Toluene's low sensitivity means that it is an excellent fuel for a heavily loaded engine.

Bestchem Toluene is denser than ordinary gasoline (0.87 g/mL vs. 0.72-0.74) and contains more energy per unit volume. Thus combustion of Bestchem Toluene leads to more energy being liberated and thus more power generated. This is in contrast to oxygenated octane boosters like ethanol or MTBE, which contain less energy per unit volume compared to gasoline. The higher heating value of Bestchem Toluene also means that the exhaust gases contain more kinetic energy, which in turn means that there is more energy to drive turbocharger vanes. In practical terms this is experienced as a faster onset of turbo boost.

How much should I use per tank of gasoline?*

A 5% or 10% increase in the aromatic content of gas will most likely be well within the refining specifications of gasoline defined by ASTM D4814, which specifies an aromatic content of between 20% and 45%. What this means is that if the 92 octane gas that you started off with had an aromatic content of say 30% and you increased it by 10% to 40% you would still be left with a mix that meets the industry definition of gasoline.

Because Bestchem Toluene is such an effective anti-knock fuel it also means that it is more difficult to ignite at low temperatures. The Formula 1 cars that ran on 84% toluene needed to have hot radiator air diverted to heat its fuel tank to 70°C to assist its vaporization.

Thus too strong a concentration of toluene will lead to poor cold start and running characteristics. It’s recommended that the concentration of toluene used not to exceed 30% or what the engine is capable of utilizing. i.e. Experiment with small increases in concentration until you can no longer detect an improvement.

Octane ratings can be very easily calculated by simple averaging

Bestchem Toluene has octane rating of 114. So use this formula to figure what octane you get when u mix Bestchem Toluene with gasoline:

Litres of gasoline x Octane (eg.95 or 98) + (Litres of Bestchem Toluene x 114)
                               Total Litres of Gasoline & Toluene


The fuel tank capacity of an EVO 8MR is 55 litres. Based on a 30% toluene mixture, filling it with 16.5 litres of Bestchem Toluene and 38.5 litres of 98-octane gasoline will yield a fuel mix of:

(38.5 litres x 98) + (16.5 litres x 114)  = 102.8 octane
                     55 litres


Packing Size:
4 Litres Bottle
18 Litres Tin
20 Litres Drum


Please contact us for other packaging sizes.

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*All recommendations and suggestions are made without guarantee since the conditions of use are beyond our control.



The Fire Safety (Petroleum and Flammable Materials) Regulations, storage and transportation of petroleum and flammable materials (P&FM) is under the Singapore Civil Defence Force (SCDF) licensing control.

  • Anyone who intends to store or transport petroleum and flammable materials beyond the stipulated exemption quantities are required to obtain a licence from SCDF. 
  • If you do not possess the P&FM storage license, we request that you activate an order only when you have fully consumed the P&FM products in your premise to ensure that you do not stock P&FM products exceeding SCDF’s stipulated exemption quantity.
  • Best Chemical Co (S) Pte Ltd holds no responsibility for violations beyond our control. Storage and transport licence is not required if the quantity stored or transported is below the licence exemption quantity (i.e. 20 litres for most P&FM). 
  • All storage of P&FM, regardless of quantity stored, have to comply with fire safety requirements for storage of flammable materials.

Visit SCDF website for more information.