The first gasoline grade number (95 or 98) describes the product’s octane rating and the following number the maximum ethanol content (5 or 10%). The octane rating describes the compression resistance of the gasoline and affects its ignition timing in the engine. Choice of the right gasoline product chiefly depends on the octane rating specified for the engine. If the instruction manual requires use of fuel with higher octane rating than 95, the 98E5 grade petrol must be preferred.
Gasoline grades are produced separately for summer and winter conditions. The volatility of winter grade, i.e. the steam pressure is higher than the summer grade. Gasoline grades are mixed with renewable components of which the most widely used is ethanol.
Gasoline 95E10 is suitable for most cars currently in use. The ethanol concentration of the basic grade of this gasoline increased to max. 10 per cent by volume in early 2011. 95E10 is suitable for nearly all car models manufactured in the 2000s. If you have doubts on whether the higher ethanol concentration is compatible with your vehicle or gasoline-powered machine or if you own an older car, we recommend finding out whether the 95E10 grade is suitable for the engine.
In order to check the compliance of 95E10 gasoline with specific passenger car models, click here.
Product and safety data sheets: Gasoline 95E10
An alternative to the 95E10 gasoline is the 98E5 suitable for all engines; the ethanol content does not exceed 5 per cent by volume. This alternative is also compatible with four-stroke and two-stroke engines requiring high-octane gasoline. In addition to these, 98E5 is a good choice for those gasoline engines which require octane rating higher than 95 or are equipped with engine control system that can make use of the advantages offered by higher octane rating.
Product and safety data sheets: Gasoline 98E5
The most popular gasoline grades in Finland are 95E10 and 98E5: the first figure describes the most important feature of gasoline, the octane rating i.e. fuel compression resistance. A higher octane number increases engine power.