Usually Mahle. I am in Europe so Mahle is reliable german supplier. However, I intent to check filter cage and seals as pressure in filter cage impacts vanos functionality.
Dear Bob,
After rebuilt of BMW M54B30 engine, I am facing issue with rough idle during cold start which appears after 20-30s which might align with timing once vanos get loaded with oil pressure and starts to move towards advance or retard timing. Once engine warms up a minute later shaking...