OSHA used to require 60PSI restriction. Of course most shops use more because it's quicker. It's also why the threads are stripped and why you can't remove your flat. Use the air tool, but do the final tightening by hand.

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Mark _______________________________
2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2 , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT
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