[micdev42]

I've just done a compression test on my 2007 N53. I thought I'd record the results here so that others know what to expect. I used this cheap amazon tester that appears well built esp. for £16:
https://www.amazon.co.uk/dp/B08C5J3GLP/

Results PSI (from cylinder 1 to 6): 225, 220, 225, 235, 225, 235

My method:
- engine cold
- remove the single fuse (in the glovebox fuse box) that controls the injectors and ignition spark (F39 on my car)
- remove all spark plugs
- screw the tester into each cylinder
- crank 8 times

HTH