Heavy-duty diesel engines get a fuel efficiency boost with OLOA 61530 from Chevron Oronite. The SAE 5W-30 additive package delivers wear protection and oxidation control to cylinders and cams, and helps extend drain intervals, the manufacturer says. The product is suitable for both low and high temperature, high shear conditions in on- and off-road applications, including construction, agriculture and mining equipment, as well as mixed fleets meeting Euro VI emissions standards. OLOA 61530 also meets ACEA E6/7/9 and API CK-4/FA-4 standards. Web: www.oronite.com