What is SUPREME HD?
SUPREME HD is made with a 15 Plus total base number (TBN). This is extremely important since air is 60% nitrogen and some engines take in 16,000 gallons of air per minute. Acidic compounds can form because of all the Nitrogen; therefore, the ability of SUPREME HD to control corrosion is a top priority. The extra protection from the high Total Base Number in SUPREME HD provides exceptional protection to reduce ring and liner wear.