Looking for a reputable BMW mechanic to repair the Valve Stem Seals on my car. Car has been burning oil for a couple months now and after multiple trips to a few different mechanics for an accurate diagnosis, its been determined for sure that the Valve Stem Seals need to be replaced. I've had the 'oil separators' replaced so far and to reduce the amount of oil that burns, car is currently using 0W-40 Synthetic oil. Briefly ran 20W-50 as well.

Estimated costs to repair I've received from various mechanics have been in the range of $4-6k. I understand this is a very labor intensive job but if there is a reputable mechanic out there that could do the job for less, please message me.

Prefer a mechanic in the Orange County or Riverside area (Southern California).

Car Details:
2006 BMW 550i
Mileage: 149k

Thanks