Originally Posted By: JimPghPA
While it is ok to remove krud and restore the outside to original, you do not want to make it shiner than new.
Keep in mind that that if you shine a surface you are changing the surface area on a microscopic level.
I once saw a modle airplane engine that would over-heat because it had been shined, and the reduction in surface area reduced the heat exchange to the point that the engine could not get rid of heat fast enough.
While that may be true on a tiny airplane, a large engine would not be affected on a notable level unless you starting grinding off the surface with a grinder...
light sanding, filing, or degreaser will NOT cause the engine to run hotter or overheat.....