Charles just reading through this thread and wanted to follow up and see if you were still having the clicking noise? as they've claimed it to be the mirror.
I've had a similar noise after investigating I found the brake pad shim wasn't doing its job and had to be readjusted a few days later the noise returned so I made an appointment at my local dealership. They replaced the shims along with the strut bearings as they said those were bad and our...
you do realize that 4 qts = 1 gal and most shops do just throw the whole 4 qts in
I myself change the oil filter every oil change and the intervals are 3-4k