Technician A says that highway diesel engines equipped with EGR should use a lube oil formulated to meet the API CI-4 classification or later. Technician B says that CI-4 oil is lower in cost and can be safely used in diesel engines built before the 2007 EPA year. Who is correct?  

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: C

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