What is Multi-grade Oil & the Benefits of using Multi-grade Oil?
The oil becomes thicker & thicker as the temperature reduces. Irrespective of the winter or summer the operating temperatures encountered by the Engines are above 100 oC, so the mono grade oil (i.e) SAE 40, 50 etc performs its expected duty during the normal operating conditions. However during winter months especially in the early morning the mono grade oil becomes very thick and starts giving lot of resistance during starting of the engine leading to more and more number of cranking. This will lead to wastage of fuel and reduced battery life. Multigrade oils are oils, which take care of the viscosity requirement of the normal operating engines, but it does not become too thick like mono grade oil during cold temperatures. The viscosity changes with temperature will be very minimal in Multigrade oils. This helps easy starting of the vehicles. Multigrade oils (i.e) 20W/40, 15W/40, 10W/30 etc., are all season oils.
