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Imo, a qt every 1500 will be well within any "specs" that a
Stlr would reference, even if you were still under some kind of
warranty. That usage would not be out of the norm, at
65K miles, and we don't know how you drive.
If there are no leaks/weeping, it is not going to be an
easy "fix"...I'd get it checked carefully by an independent
BMW wrench, for leaks, and if none, I'd forget about the
"problem" and just top up every 1-1500 miles.
GL,mD
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