I would have taken their advice at any point during this exercise. I have had excellent results with Jessel, over three vehicles of my own and others in the family. The service manager is good, and so is the customer relations manager. Interesting that they decided to do further investigation on their dime after the first round didn't find anything. That is the type of service that I have received in the past there.

The boroscope is showing cylinder wear, but it isn't clear to me whether it is a ring problem or whatever. You can have a look at the pictures, but you won't likely see a root cause, just distress on the cylinder wall.

Have Jessel (or an independent) pull the head so you know what the real problem is.

And skip BMWNA, they don't cover Canada, just USA. Not sure why you would call the manufacturer in any case, for a vehicle that is well out of warranty. The service is coming from an independent business, not from BMW. And Jessel is very highly rated on the customer satisfaction stats.

Good luck.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue