SynBlend Semi-Synthetic Oil - 10W-40 - 5 U.S. gal - Bucket Semi-synthetic, ester-based 4-stroke engine oil designed to ensure optimum protection, peak performance, and positive clutch feel, Surface-active formulation provides excellent film thickness and viscosity stability across all operating temperatures, Advanced, proprietary additive system keeps your engine running clean, trouble- and extends the life of the machine, Made in the U.S.A.