Free Shipping - 30W, 30 weight diesel oil (CF) High Quality Heavy Duty Diesel Engine Oils use well-proven performance additives to fight engine wear and prevent deposits, providing reliable lubrication and consistent performance. 30W provides excellent wear protection that promotes engine durability. It has a low ash content which minimizes the formation of deposits and keeps intake ports clean. It offers excellent rust and corrosion protection for critical engine parts. CF/CF-2