Technician A says that CJ-4 diesel engine lubricating oil is backward compatible with all previous diesel engine lube oil classifications. Technician B says that the digit 4, in CJ-4 means that the oil is suitable for 4-stroke cycle use. Who is right?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: C
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