What's the Difference Between 15W40 and 20W50 Engine Oil?
1 Answers
15W40 and 20W50 engine oils differ in the following aspects: 1. 15W40 has a viscosity ranging between 13.5~16.0 and a pour point around -25℃. 2. 20W50 has a viscosity ranging between 16.5~20.0 and a pour point around -19℃. Detailed classification of lubricating oils: 1. Winter oil grades include: 0W, 5W, 10W, 15W, 20W, 25W. 2. Summer oil grades include: 20, 30, 40, 50. 3. All-season oil grades include: 5W/20, 5W/30, 5W/40, 5W/50, 10W/20, 10W/30, 10W/40, 10W/50, 15W/20, 15W/30, 15W/40, 15W/50, 20W/20, 20W/30, 20W/40, 20W/50.