I am paranoid about squeaks and rattles. I have various small "fixes" that I use to stop them annoying me!

After a little work, my wife's 99ML320 (40k) is a 10.

My 2000 Toyota Landcuiser (55k) is also now a 10.

I find that a roll of weather stripping tape, some foam rubber, a can of sliocone spray and a small screwdriver can fix just about anything.

Plastic rubbing on plastic is really easy fixed with a squirt of silicone spray.