Timing cover do Oxidize overtime. Most timing covers are aluminum and the metals in the water slowly oxidized. Also if it’s over tightened and the kids could give away, there’s more metal, but oxidation. This is probably a very good spot to look for that.
It has 176,000 miles on it. I'm the second owner and have all the maintenance records. I did notice a few drops of coolant by the cover late last year. I'm going to pull the cover off tomorrow. Thanks !
