John, my choice of paints are
Tamiya, not to everyones taste as they do not have the vast choice of colours and shades that other manufactures provide, but I have always used them and I am used to how much to thin, and what pressures work best so I stick with them. I have tried Vallejo a couple of times but I just can not get on with them them, each to their own I suppose.
To answer your question, the paint on the engine is Metallic grey with just a drop of Nato brown to try and replicate the magnesium cases of the original, perhaps not spot on but it will do for me.
Andy.