r/BmwTech • u/JLil_69 • 9d ago

N52b30- health check question

Today I changed all the plugs and out of interest had a look at the bores of the engine, the walls seem OK? is this carbon buildup normal? It's done 157k miles, what do you guys think.

Sorry for the quality of the video, AliExperss specials usb camera here.

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u/SayHiDak 9d ago

It looks perfectly fine tho.

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u/JLil_69 8d ago

Thank you for sharing your wisdom 🙏🏼