Date registered: Dec 2012
Vehicle: 89 190E2.6- 5-speed Manual, 95 E320 Sportsline-sold, 2001 E320 4matic Wagon-sold
Location: San Jose, California
Mentioned: 10 Post(s)
Quoted: 544 Post(s)
Well stradivari, those numbers are perfect, so rings are good, valves are good.
Your valve guides do not appear to show the symptom of dripping oil in the the combustion chambers when after cool down either.
I assume the leak-down test did not include a cursory check of the valve guides but I'm guessing no mess up there either. Hopefully they did not forget to put the valve seals in.
We have also ruled out the blow-by gasses being a major issue.
Honesty, at this point, I'm not sure if I would go deeper into this and pull the head off again with a new mechanic.
Seems you have no other issues related to oil burning, meaning nothing else is getting effect by it. You mentioned some idle hunt, etc but those are not related to oil burning.
Unfortunately, in this state, it will only take a couple of years before you will have to change the Catalytic converter. Also, you will need to change your spark plugs once a year, because they will get dirty. My car burns the same mount and there are no issues with ignition or combustion after nearly one year after the last tune-up/spark plug change. Getting ready for a tune-up now.
My position remains unchanged, if I were you, I would take your car to the dealership and tell them what happened to date. Ask them if they can help you. Most likely they will say "yep, we can fix this, and it will cost you xxxx dollars". Remember they are there to make some money on car repairs but they want a happy customer in hopes to see you a new car some day. If you can stomach the xxxx dollars, go for it, because if it does not get fixed, you will have it all back, I truly believe that.
This has been my experience with the dealership here.
And the good news is you actually know more about your engine then they do now, after all the tests, so they are not going to be able to BS you in any way.