I'm pretty aggressive, and have yet to have to fill up my DEF before a maintenance was due, and that's with 55k on the clock after 21 months.
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Current: '21 M5C, '15 X6 50i Previous: '18 M550i, '16 550i, '11 335is, '09 E93 M3 DCT, '10 E90 335d, '07 E90 328i
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