For the do-it-yourself'er or the professional mechanic
This valve adjustment kit includes the factory magnetic tool and full shim kit necessary when installing new shims in your engine during reassembly, valve adjustment, or camshaft install.
BMW Recommends that your valves are checked and adjusted as needed every 30K miles, most independent shops check every 40-50k.
If your a Do-It-Yourself enthusiast; you can do this job yourself and save hundreds in labor.