BMW S54 Valve Adjustment Shim Kit - Wiseco VSK4
The S54 engine is unique for modern BMW engine because it uses solid lifters instead of hydraulic lifters. This lifter style is one of the primary advantage over hydraulic lifters that allows more durable and reliable high engine speed operation. However, the setup is required valve adjustments every 30,000 miles. Incorrect valve lash causes performance problems and may result in a noisy valve train, a failed emissions test, and in extreme circumstances engine damage. If you want to perform this service yourself, shim kit is what you need. It comes in a professional-looking storage box that contains standard shim sizes, each with its size marked on one face.