The Pencool® brand engine coolant line is well known in the industry as a supplemental coolant additive (SCA). In addition, our Need-Release® cooling system filters have been helping fleets and Owner/Operators extend their coolant service intervals. Penray offers a complete line of diesel fuel additives for improved MPG, and cold weather products to keep vehicles running through-out the winter. In addition, maintenance products that ensure your vehicle runs day in and day out keeping you on the road.