The dipstick goes down to the very bottom of the tube but not into the pan. You could put some sort of flexible rod (spare dipstick?) down there to measure the depth exactly
The tube enters the sump pan near the very bottom. The correct level, I've found, is around the top level of the pan(maybe slightly lower), where the gasket is, so maybe 40-50mm from the bottom of the pan. This is off the top of my head, I should realy check mine though. Good luck.
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