- Change all valve seals, use BMW OEM seals only.
- You can buy these seals and give them to the machine shop.
- Valve brand: in the Volvo forum there is a debate of OEM Valve ($80/each for the Volvo, idk BMW cost) vs Osvat vs TRW etc.
- Some people think the cause of burned valve is from leaky valve seals ---> oil caking on the stem ---> valves cannot close properly.

- Does anyone know the price for the BMW valve?

- From now on, use only Octane 91 gas, which should reduce the risk of burned valves.
- Clean the injectors too.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT