I bought a 1UZ as part of a package a while ago and when i got it the owner said the engine was "breathing" which didn't really bother me as they're cheap enough to replace anyway. Only wanted the package for the other parts which came with it. However just out of interest i took the cam covers off to see what it looked like under there. As you can see, under the left hand cam cover is a lot darker. I just put that down to the rings being a problem on that side. However i just took the covers off my new motor also and it seems to have exactly the same thing?
Just wondering if anyone can explain why this would possibly be happening? And if anyone else has noticed that the oil looks burnt in the left hand side compared to the new looking oil in the right? Something to do with the PCV maybe?
Old motor Right hand side
Old motor left hand side
New motor left hand side
Just wondering if anyone can explain why this would possibly be happening? And if anyone else has noticed that the oil looks burnt in the left hand side compared to the new looking oil in the right? Something to do with the PCV maybe?
Old motor Right hand side
![pict025231qr9.jpg](http://img339.imageshack.us/img339/6762/pict025231qr9.jpg)
Old motor left hand side
![pict025232ic4.jpg](http://img152.imageshack.us/img152/6958/pict025232ic4.jpg)
New motor left hand side
![newmotorlhsmh0.jpg](http://img205.imageshack.us/img205/7830/newmotorlhsmh0.jpg)