🔍 Key Concepts

• Function of different lubricating oil additives (what each type is designed to do) • Meaning of pour point in lubricating oil and how temperature affects flow • Difference between additives that improve flow at low temperature vs those that protect under high load or help mixing with water

💭 Think About

• Think about what happens to lubricating oil when temperature drops and it starts to become waxy or gel-like—what kind of additive would help it keep flowing? • Which type of additive name sounds like it is specifically related to changing the temperature at which something will pour or flow? • Eliminate the options that are clearly related to other functions, like mixing oil with water or handling heavy loads on gear teeth.

✅ Before You Answer

• Know that pour point is the lowest temperature at which oil will still flow when cooled under specified conditions. • Identify which additives are primarily used for low-temperature flow improvement, not for foaming, detergency, or load carrying. • Confirm which option’s name directly suggests lowering or reducing a temperature-related property of the oil.