HardDrive’s Single Weight Engine Oil is recommended for pre-Evolution V-twin motorcycles and meets or exceeds Harley-Davidson warranty criteria. This single weight oil is made from severely hydrocracked base oils for the ultimate in purity. The oil has excellent film strength that resists break down and increases service life. Meets or exceeds API CI-4/SL service rating. Sold in quarts (12 per case) 50 wt – 1 qt – $6.95; 60 wt – 1 qt – $6.95.