D12A and D12B From 94 to 98. Were on FH12 and WG D12C - Euro-2, Euro-3 and EPA 97 from 1998 to 2002 D12D (Euro-3 and EPA 2002 (with EGR). from 2002 to 2005. Were used on FH, VN, Renault and Mack. D12D was used on Version-2 only