I would retake cyl 6 compression... Just in case.
Best news, it's all good.
Worst case, you confirm what you already had as a result.
I am actually rebuilding my engine N54. My compression was low but all cylinders about the same. I also have bad oil leaks.
I have open a Youtube Channel "Quebec DIY". If you are interested in following the complete project videos, just subscribe and you'll get posted as new videos are released. Videos start with numbers (in the order that tasks were performed).
https://www.youtube.com/channel/UCrf...VKDUi-w/videos
Engine Removal is covered through 17 videos.
01 Underhood Shield Removal (Actual Youtube name: 01 BMW 135i N54 E82 - Engine Removal - Underhodd shield Removal)
02 Gas Pressure Relief (Actual Youtube name: 01 BMW 135i N54 E82 - Engine Removal - Gas Pressure Relief)
03 Air Cabin Filter and Engine Cover Removal
04 Intake Air Duct Removal
05 Radiator Fan Removal
06 Intercooler Removal
07 Throttle Body Air Pipe Removal
08 Vacuum Accumulators Removal
09 Water Pump Removal
10 Radiator and Thermostat Removal
11 Vacuum Valve Bracket Removal
12 Pre-Catalyst Removal
13 Belt, Accessories 1st step, Intake, Starter Removal
14 Exhaust, Heat Shield, Drive Shaft Removal
15 Transmission Removal
16 Accessories 2nd Step, Wiring, Fuel Line Removal
17 Engine Removal Final
Engine disassemble is covered through 8 videos
20 Oil Leaks Inspection, Pulleys Removal
21 Turbos Removal
22 Cyl Head Cover, Coil Packs and Spark Plugs, Fuel Rail Removal
23 Engine Oil, Vacuum and High Pressure Fuel Pump Removal
24 Timing Chain 1st Step and Cylinder Head Removal
25 Oil Pan and Pump Removal
26 Pistons, Connecting Rods, Crank Shaft, Timing Chains 2nd Step Removal
In progress...
27 Fuel Injectors, Cams, Valves, Oil Filter Housing Removal
Engine Rework Should be covered in about 4 or 5 videos
31 Getting Engine Block Ready For Pistons Over Size
In progress
30 Engine Inspection
32 Checking Fit for Cylinders - Piston - Rings - Main and Connecting Rods Bearings
33 Cylinder Head Cleaning
A lot more to come as the project is going on...