Update: tech confirmed that he did drain the pan from the plug and only filled with the 1.9L. The dealer admitted fault and redid the service, draining whatever was in there and filling it up again, which this time took 4.5L of fluid. Passed the function tests on ISTA and finally got a good measurement reading.
It was supposed to be a drain and fill from the beginning with the filter being changed. The tech was given incorrect information and that's what led to the screw up.
Best part is, they didn't up charge me for their mistake like how some dealers usually do, so I basically got a drain and fill with a filter for $500. Will be picking up the car in the next hour or so, I'll update you guys in a bit
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2016 BMW M5
2019 BMW X5-This will hit 10's in the 1/4 mile
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