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Taking the car to dealer to top off an oil was your 1st mistake. I have an extra bottle in the trunk just in case but never needed ot.
My car is at 13K miles and never went low on oil. I did change the oil at 5K and 10k miles. Not sure what your folks are doing to your cars or how you are driving them.
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2020 G20 M340 xDrive - Portimao Blue - ZDA|ZPP|ZPX|1CR|1PE|6NW|6WD
2016 F10 535i xDrive - AW - Retired 
2011 E92 M3 - AW……………....ED April 29th, 2010 - Retired
2007 E92 335i -Space Gray.....ED Oct 19th, 2006 - Retired
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