Originally Posted by RPM90
This is interesting, but really has nothing to do with the modern models.
BMW started these maintenance intervals, I think, in 1999, may have been sooner. The new E46 came out then. This has been at least 10yrs ago, and since then BMW cars rate as some of the best for used car value.
When BMW switched to longer oil drain intervals they also switched to synthetic oil, and over the years synthetic has proven it's longer drain capabilities over and over.
That's correct, the move from (approx.) 7,500 to 15,000 mile oil changes coincided with the switch to OEM sythetic oil with the '99 E46 models.