The quick changers also provide these perks...

Forget to put in the oil....
Lie about the type oil if they put it in....
Top off the brake fluid reservoir with water...
Use an air wrench to strip out the oil pan threads...
Steal tools left in the passenger seat...
Try to scare people into unneeded service...
Use the lowest quality parts they can find....
I will not use them ....any time anywhere....

To provide balance to the above... I am sure there are some honest ones somewhere....
The last one I trusted was about in 1984....and they were on the downhill slide....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)