Factors > Lubricant
Lubricant oil is used in engines to reduce friction and to cool down specific components. Lubricant oil enters the combustion chamber and is oxidized during combustion, before it is exhausted to the atmosphere. The hydrocarbon composition of lube oil means that it unintentionally contributes to the CO2 emissions without taking part to the energy consumption of road transport. The only exception is two-stroke engines where the lubricant oil is intentionally delivered to the cylinder and part of the lubricant oil could be used to deliver some energy to the engine (especially in older two-stroke engines). Emission factors of CO2 due to lubricant oil consumption per vehicle technology are provided in this form, which are based on typical lubricant oil consumption factors for different vehicle types. These emission factors can be used "as is" unless there are better estimates. The user may also select whether lube oil consumption will be estimated in the total CO2 emissions or not (Add CO2 Emissions due to lube-oil).
Own emission factors may be presented. One can view the factors for each sector through the Sector drop-down list.