In the original Star Wars after the droiids wander through the dessert the stormtroopers investigate. One bends down and picks up some springs and gears and says "Look sir, Droids."
Droids leaving springs and gears behind would be like people leaving toes and fingers. Just doesn't add up.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes