Which of the folloWhich type of oil pump is most commonly used in current highway diesel engines? Question 7 options: External gear Plunger Centrifugal Vanewing statements would usually correctly describe the relative temperatures of the coolant and lubricant when the engine is at operating temperature? Question 6 options: Coolant temperatures are higher than engine oil temperatures. Engine oil temperatures are higher than coolant temperatures. Coolant and engine oil temperatures should be equal