[Hydroglen]

Alfa Romeo and many Chryslers + had reversed threads so that left is left
and right is right so basically self tightening.
I always tighten my own wheels and in the rare occasions when a shop does
it, I have them use a hand wrench.
Anybody who allows a garage to use an impact gun on wheel nuts is inviting
disaster. The impact damages the nuts and may overtighten them as in an
effort to be safe, the settings are set too high....then try undoing them
when you have a flat.
Dorien