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If it was just failures due to lack of oil proper oil change intervals BMW could easily deny a problem exists. Furthermore BMW provides service during the first 50,000 miles under warranty. BMW created the CBS algorithms for oil changes. This means a low number of vehicles with lack of maintenance for significant mileage.
If you think your timing chain is going to be fine changing your oil earlier your kidding yourself You may delay it at best. I maintained my Mazdaspeed6 better than recommended and the timing chain stretched. Mazda also did a half way warranty extension to 7yrs/70,000 miles. Mine was well over the mileage and I had to pay for the replacement. If the chain is defective it's going to fail
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