Do similar year models of BMWs have the same Vanos issues that these M3s experience? I know the forums are just a place where people complain, rather than complement the cars, so there is an abundance of problem posts.. but I couldn't find much info on whether it was common? I'm considering spending the un-needed money on a vanos proactive service with those new bolts and such, even though my car has had 0 issues. Thoughts?