Originally Posted by BMWE90FANATIC
its a good measure to replace them for piece of mind. if the tops of the bolts are blue they need replacing per BMW recommendation. I would replace them regardless tho.
For peace of mind, get new ones. the bolts on mine were not painted blue. The parts guy also said I don't need them. My bolts are steel bolts, not aluminum.
The bolts with blue on them are aluminum bolts, which once torqued to spec, are stretched. re using them will not be torqued to the accurate value, plus there can be a hairline crack/break in them that will eventually break off and leak.
Blue = replace (required)
No blue = replace for peace of mind/not a bad idea