I've searched the forum but no luck finding the answer to my question...
What is the significance of the "markings" left by mechanics on various components in the engine compartment. (e.g. a yellow marking on the upper radiator hose where it meets the housing) There are various other marks of various colors elsewhere, usually on a fastener or at a connecting junction.
What do these mean and do the different colors signify anything?
Many thanks in advance!
1991 300D 2.5 Turbo