The correct answer is (d) SAE 70.
SAE stands for Society of Automotive Engineers. SAE viscosity grades are used to classify the viscosity of engine oils. The higher the SAE grade, the thicker the oil. SAE 70 oil is the thickest of the four options, followed by SAE 60, SAE 50, and SAE 40.
Thicker oils are better for cold weather conditions, as they provide more protection for the engine when it is cold. However, thicker oils can also cause the engine to run less efficiently in warm weather conditions.
It is important to choose the correct SAE grade of oil for your car. If you use an oil that is too thin, it will not provide enough protection for your engine. If you use an oil that is too thick, it can cause the engine to run less efficiently.
You can find the recommended SAE grade of oil for your car in your owner’s manual.