Bolts for structural fixings are required to meet certain specifications and standards to avoid material defects causing failure - including stretching - and whether they can be used only once. (I am currently looking at this for offshore lifting of generator pods.) There is usually a marking on a bolt head to indicate the quality/type of bolt but I am not sure that the spacer and wheel lug bolts have any such indicator? Obviously removing and re-placing spacers and wheel bolts and over torquing them will have a long term effect. I will do some more digging on this. 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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