Topline Express  is the most advanced development in lubrication chemistry resulting in a world capable diesel engine oil. Topline Express has been formulated specifically to meet the requirements of European, American and Japanese design emission engines including those engines which incorporate Exhaust Gas Recycling (EGR) to provide fuel efficiency, high wear protection and long drain capability. EGR can add to deposits forming in the combustion chamber, and therefore Topline Express low sulphated ash content assists in maintaining engine and injector cleanliness