MB Dealership says my cam plugs and centrifuge need service because they are leaking oil on my 2008 CLK550. Has about 56k miles. They quoted me $450 for that, which based on another thread I saw on here seems crazy. Thought I would bring this topic up again to see what others suggest as a fair price & if I should just go to a local mechanic who has been ok for other cars, but is not a MB specialist. Any thoughts are appreciated.