*Actual results will vary depending upon vehicle type, load and other driving conditions. Tests show up to 2.6% fuel economy improvement with Class 8 trucks running Volvo D12D engines when compared to SAE 15W-40 oil*. Always confirm that the product selected is consistent with the original equipment manufacturer's recommendation for the equipment operating conditions and customer's maintenance practices. SAE J1321 Fuel Consumption Tests. Actual results will vary depending upon vehicle type, load and other driving conditions.