Ok guys, I did compression testing and here are the results:
1. 175psi
2. 180psi
3. 160-65psi
4. 180 psi
5. 140 psi
6. 25-30psi
NOTE: The engine was cold (60-70 degrees Fahrenheit outside)
I already taken the head off and you can clearly see it was cyl. 6. I'll post picture of the gasket (the head is already in the shop). The head had a small chunk missing but they said that they are able to fix it. Since I wanted to do it right the 1st time, I've also got the valve stems and gave them to the shop so they can replace them, they also informed me that exhaust valves had bad valve guides. So they quoted me almost 600 bucks for everything, so im guessing thats not bad. Now i got few questions:
1. Whats the symptom of bad valve guides?
2. Does exhaust system from any 6 cylinder mercedes is the same? (the guy took it off, and some1 in his family scrap it because they "thought" it was junk... it was right before i went to pick it up -_-)
I'll keep you guys updated
Thanks!