This video goes over the valve adjustment procedure on the BMW S54 engine. You should be checking and adjusting the valves every 20-30k miles (in the video I had it confused since the 1st valve adjustment needs to be done at 15-20k miles and then its every 20k-30k miles). I have various links below for the parts needed as well as other videos and information that will help with this DIY.

Here are the clearance measurements:
Intake: 0.18mm - 0.23mm. (0.007in - 0.009in)
Exhaust: 0.28mm - 0.33mm (0.011in - 0.013in)

Parts:

Valve Adjustment Kit by ECS (Shims, Tools, VCG):
https://click.linksynergy.com/link?id...

S54 Special Crank Socket (Check if you need it):
https://click.linksynergy.com/link?id...

Digital Caliper:
https://click.linksynergy.com/link?id...

Videos:

How to remove the clutch fan and fan shroud:
   • Waterpump & Thermostat Replacement On...  

Valve Cover Gasket DIY:
   • How To Change S54 Valve Cover Gasket-...  

S54 Playlist (Vanos and More):
   • S54 E46 M3 Videos  

Ultimate E46 M3 Torque Values Guide:
https://drive.google.com/file/d/1elAi...

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00:00 Intro
00:42 What is a valve adjustment?
01:24 How often do you need to do them?
02:38 Important Info
03:13 Prerequisites
03:50 Tools Required
05:04 Beginning of Procedure
09:49 Measuring Clearances
13:30 Removing Shims
15:00 Measuring Shim With Caliper
15:38 Putting in New Shim
20:13 Rechecking Clearance
21:07 Final Tips