Here is the formula number for Cadillac engine dark blue according to paint manufacturers:
• BASF aka R-M: Formula Number 243212. BASF carries this color in 22 varieties of paint. Everything from base coat to single stage and high end to low end paint.
• Dupont: Formula Number BS454. Dupont has a cross over formula that is available in their most popular varieties. The color swatch has been checked and looks correct
It is recommended that the BASF formula be used. R-M (BASF) was a main paint supplier to Cadillac when engines were painted dark blue and it looks like R-M has maintained this color formula until the present time.