[n00b0rKa]

Hey guys!

My 2005 E90 equipped with an N52B25 engine is consuming a lot of oil (1l every 500 km), and I suspect the valve stem seals being faulty. I wanted to rule out other causes, so I had a peek inside my cylinders with a borescope. I'm really curious what do you think about the footage as well.

I know the video is pretty poor quality, but try taking the black oil drip marks as landmarks for orientation. By the way, this oil seeping in from the top of the cylinders is highly suspicious for valve stem seals I think.
The video:

Thank you guys in advance, nbK

[floydarogers]

Originally Posted by n00b0rKa

Hey guys!

My 2005 E90 equipped with an N52B25 engine is consuming a lot of oil (1l every 500 km), and I suspect the valve stem seals being faulty. I wanted to rule out other causes, so I had a peek inside my cylinders with a borescope. I'm really curious what do you think about the footage as well.

I know the video is pretty poor quality, but try taking the black oil drip marks as landmarks for orientation. By the way, this oil seeping in from the top of the cylinders is highly suspicious for valve stem seals I think.
...

Thank you guys in advance, nbK

The only way to decide about cylinder wear is to use a micrometer and measure the taper from top to bottom of the piston wear.

I can't tell anything from the video.

[n00b0rKa]

Originally Posted by floydarogers

The only way to decide about cylinder wear is to use a micrometer and measure the taper from top to bottom of the piston wear.

I can't tell anything from the video.

You are right, and the quality of the footage is also poor, but I think anything that would explain this kind of smoke from inside the cylinders should be seen:
https://www.youtube.com/watch?v=jGkHWhbuMQ0