Sir i don't have the idea relating to it, that does it reduce life or not 
and yes it will look awkward if i painted it full black that's y not gonna paint it full black few different colors will be added to
and plz share any info relating to paint on engine so i can inform my friend who is also looking forward to paint his engine black because it was his idea to paint the engine black, can u provide me reasons that y should we not paint our engines 