Join Date: Feb 2008
Location: St. Petersburg Florida
The only way to get a really nice clean look for your painted engine components is to remove them, media blast them, and repaint. I use VHT wrinkle red and it's reasonably close to the OEM color to pass. If you do all your components they also will match. If you "touch up" the effect will be mottled - older sections will simply be different because of age and heat. The tricky one to paint is the back plate on the plenum - it is attached to the throttle bodies. On my car everything was removed, media blasted (walnut shells) then sprayed. After the paint is good and dry you use a sanding block on the raised lettering and ribbing to re-reveal the aluminum to recreate the OEM look.
Your oil filler cap should not be vibrating loose. It should fit snugly, have an o-ring or gasket, and should not be leaking oil on to the engine. That's a dangerous situation as the oil on the manifold will smoke, stink, and possibly ignite. Fix that situation first thing.
1989 Turbo Esprit