Thanks guys.
Next up is the P&W engine assembly. Kinda goofy installation, but does allow access to the cowl flaps.
So painted my engine flat black and dry brushed Testors dark neutral grey. This allows for the cylinder heads to pop out and represents grime in between the fins. The front gear box is done in reverse, painted dark neutral grey then ldry brushed with flat black and lightly with Testors Rubber (which is a good representation of oil).