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GM Detroit Diesel 6.2L & 6.5L (1981-2000)      The GM Detroit Diesel started out in 1981 as a fuel efficient alternative to the popular small block and big block Chevrolet engines.     RPO Codes for this engine were as follows:         LH6 - 6.2L - VIN Code C, with EGR         LL4 - 6.2L - VIN Code J, W/O EGR         L49 - 6.5L - VIN Code P, N/A         L56 - 6.5L - VIN Code S, Turbocharged, EGR         L65 - 6.5L - VIN code F, Turbocharged, W/O EGR         L57 - 6.5L - Heavy Duty         LQM - 6.5L - Heavy Duty         LQN - 6.5L - Heavy Duty