Originally Posted by BarabooBob
With that type of washer there should be some paint scuffing visible if they were tightened down properly at the factory. If the paint isn't scuffed, they were never tight.
I don't see any such "scuffing" in the pic's but that's just looking at a picture.
Loose fasteners are all to common when there are lax QC controls.
At the other end of the spectrum some manufacturers have a system for checking EVERY fastener before the vehicle leaves the factory. On my Titan every fastener under the hood and on the frame has a crayon mark (or paint pen) across the nut/bolt head and onto surrounding metal that shows it was checked. Also shows if it's loosened if witness marks are no longer aligned.
Overkill? Not to me. Going into 17th year of use and not a single rattle.