The tool had difficulty fitting the cap on a 2018 BMW X5 with N55 engine. As mentioned, I've been playing around with the tool to see if there's a spot where it fits better. I did not find this place. I had to hand tap the filter housing with a tool - no hammer needed. I had to take the tool out of the cap after it was removed. I ended up replacing my plastic oil cap with an aluminum hex cap for easier future removal. After separating the tool from the cap, I measured both with a caliper. The standard oil cap tapers slightly from 86.14mm at the top to 86.25mm at the bottom of the flat. With the tool, some of the internal distances between planes were 86.5mm and some were smaller - 86.2mm (I didn't measure all 16). The tools may be bent during transport/loading or not quite round.
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