I started out looking for Chevy gray. I found some references on Amazon and a couple other sites to find out it has been discontinued and I could not find it anywhere. After a lot of research each plant mixed their own engine color. No set color code. Some shade of gray. They were all close but could have slight differences. The closest match I could find from the original few chips on my engine is F**d gray. It turned out pretty good. You also mentioned car vs. truck. Cars were blue and trucks were gray.
