Convoy® 15W40 can save you time and money by extending drain intervals 15,000 miles in light duty diesels and more in semi-trucks. 13 TBN neutralizes harmful acids protecting diesel pickups, semis, off-road equipment and farm equipment from harmful acids. Uniquely formulated, parasynthetic oil blends the best synthetic oil (PAO) and the finest conventional oils and additives. Molybdenum (moly) is added for ultimate wear protection. Convoy provides immediate start-up lubrication for minimal wear and reduced friction - improving fuel economy and extending engine life.