Question

all of the following are advantages of synthetic oil over conventional oil except: a. cost effectiveness. b. better low temperature viscosity. c. fewer wax impurities. d. operation at higher temperatures.

Explanation:

Synthetic oil generally has better low - temperature viscosity, fewer wax impurities, and can operate at higher temperatures compared to conventional oil. However, synthetic oil is usually more expensive, so it is not cost - effective compared to conventional oil in most cases.

Answer:

A. Cost effectiveness