Which of the following oil grades would be easiest to start in cold weather?
A. 20W - 40
B. 20W - 50
C. 0W - 40
D. [tex]$5 W-30$
Answer (2)
The 'W' number in oil grades indicates viscosity at low temperatures; lower numbers mean better cold-weather performance.
Compare the 'W' numbers of the given oil grades: 20W-40 (20), 20W-50 (20), 0W-40 (0), and 5W-30 (5).
Identify the smallest 'W' number, which is 0.
The oil grade with the smallest 'W' number is the easiest to start in cold weather: 0 W − 40 .
Explanation
Understanding the Problem The problem asks us to identify the oil grade that starts easiest in cold weather from the given options: 20W-40, 20W-50, 0W-40, and 5W-30. The 'W' in the oil grade stands for 'Winter', and the number preceding it indicates the oil's viscosity at low temperatures. Lower 'W' numbers indicate that the oil is less viscous at cold temperatures, meaning it flows more easily and thus allows for easier engine starting in cold weather.
Comparing the 'W' Numbers To determine the easiest oil grade to start in cold weather, we need to compare the 'W' numbers of the given options. The oil grades are 20W-40, 20W-50, 0W-40, and 5W-30. The corresponding 'W' numbers are 20, 20, 0, and 5.
Identifying the Smallest 'W' Number Comparing the 'W' numbers, we have 20, 20, 0, and 5. The smallest number is 0. Therefore, the oil grade with '0W' will perform the best in cold weather.
Determining the Easiest Oil Grade to Start in Cold Weather The oil grade corresponding to the smallest 'W' number (0) is 0W-40. This oil will have the lowest viscosity at cold temperatures, making it the easiest to start the engine in cold weather compared to the other options.
Final Answer Therefore, the oil grade that would be easiest to start in cold weather is 0 W − 40 .
Examples
Understanding oil viscosity grades is crucial for maintaining vehicle performance in varying climates. For instance, in regions with consistently cold winters, using a lower 'W' grade oil like 0W-40 ensures that the engine starts smoothly, preventing potential damage from thick, sluggish oil. Conversely, in hotter climates, a higher 'W' grade might be more suitable. Knowing how to interpret these grades allows vehicle owners to optimize their engine's performance and longevity based on their local weather conditions, saving on maintenance costs and ensuring reliable operation.
The easiest oil grade to start in cold weather is 0W-40, as it has the lowest viscosity indicated by its 'W' number. Lower 'W' numbers signify better cold-weather performance. Therefore, 0W-40 is the best choice among the given options.
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