| abstract |
A method of operating a diesel engine comprises lubricating the diesel engine with a lubricating composition and using a biofuel as fuel, wherein the lubricating composition comprises a base oil belonging to Group III or Group II of the API base oil categories, from 0.5 to 5% by mass of a phenolic anti-oxidant, and from 0.5 to 5% by mass of an amine-based anti-oxidant, the total content of the anti-oxidants being at least 2% by mass. |