Which of the following statements is LEAST-Likely true?
A. Friction occurs between the piston rings and cylinder walls.
B. Low-tension piston rings were introduced in the mid-1980s to improve fuel economy.
C. Compression rings account for about 60% of the total drag on a cylinder wall, and the oil ring accounts for 20%.
D. Cast iron rings are used in re-ring jobs when the cylinder walls have not been re-bored.
Answer: C
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