Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Valve Depressor
Valve depressors without CPS -functionality (C amshaft P rofile S hifting) have a coating of DLC (D iamond L ike C arbon).
It is the tops of the valve depressors that are coated with DLC. The layer with diamond-like carbon structure has a depth of 2μm, is very hard and has self-lubricating properties. The surface reduces the friction against the camshaft lobes and thus gives lower fuel consumption and longer service life.
Thanks to very good adhesion and toughness the DLC-coating can handle very high loads. The change applies to valve depressors without CPS-functionality.
This means that it concerns depressors in position:
- Engine B6304T4 (Ulev2) Exhaust, inlet
- Engine B6324S4 (Pzev) Exhaust, inlet
- Engine B6324S5 (Ulev) Exhaust
If needed the DLC-coated depressors can also be used on older engines.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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