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Q: 2005 BMW 545I Oil leak on 2005 BMW 545i

Right at 100,000 miles at a routine oil change it was noted that a large amount of oil had been leaking under plastic undercarriage. I took to my Mechanic who said it was a big job requiring about 15-20 hours of labor. He changed oil gaskets (?) drivers side, passenger side and center. Mechanic test drove, said the driver's side was still leaking and replaced the seal once again. The car was returned and is STILL leaking oil which seams to be coming again from the driver's side. Large spots of oil on my driveway each morning. Paid nearly $1000 and the repair took forever, not so eager to bring it back to this mechanic to fix as it appears not to be what the initial problem was, if he truly replaced the seals in the first place. Does anyone know of any problems with the 545I with regard to oil leaks? I purchased my car about a year ago at 95k and have only driven it about 5 months till it reached 100k and have not driven it since, it has lived at the mechanics shop and has sat in my driveway leaking oil since its return. Any advice would be appreciated!
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advise a BMW specialty shop only. you do not want anyone working on your car that has a parking lot full of Toyotas or Chevys.
He only fixes BMW's. However, not for BMW. I see several forums on these cars and oil leaks I'm wondering if there was/are other places seals or gaskets typically go bad after 100k.
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there are several very common leaks on both the six cylinder
and eight cylinder BMW's. if your guy knows BMW, then he should be familiar with using the dye method. everything has to be cleaned off; then dye is added to the engine oil. after
driving no more than 50 miles, the engine is checked with a
blacklight. when the oil leaks out, the tracer dye will glow
under blacklight. this very basic test identifies the leak with
positive proof. i have never had a BMW in my shop over 5 days;
any part needed can be ordered overnight and if he took longer
than that, your guy may have some "scheduling" issues!
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