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N62 Z3 Part 31: The End of the Beginning & Beginning of the 4.8 era

Well, after driving the car more it seems the smoking out of the exhaust did not fully resolve and cylinder 7 spark plug was always oily and 8 was oily, although less so than 7. I decided to investigate deeper in the engine as I had a hunch about what was going on. And unfortunately, that hunch was right.

I had read a few posts over the years and seen a few documented cases of scored cylinders in the N62 which can cause excessive crankcase pressure and smoking. Cylinder 8 had cylinder wall scoring, as pictured below:

But cylinder 7 was even worse. On one side, you can see deep scoring and it looks like the coating of some sort is being scraped off. I'm not entirely sure what happened, or why, it never overheated (in my ownership, anyways) and oddly enough, it still runs pretty well - it juts smokes a little bit, but consistently.

But the opposite side of cylinder 7 was a whole different story. Not even sure what I'm looking at here, but I know for sure it isn't good:

So cosmetics are on hold and a 4.8 engine will be going in soon. I am currently focusing on emptying my storage unit as I am sick of paying monthly rent over there - but as soon as that's done, this will be my priority.



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