90 300SEL Overheated, No Compression

[David8215]

Need some serious help. My 1990 300SEL M103 Engine has been through hell while my younger sister was driving it. Anyway she was on the highway when she lost engine power. There was smoke and temp gauge was high. After car was towed home I inspected it. Removed spark plugs and found water/oil in all cylinders, engine does turns over, 2 cylinders have 25 psi compression and others have Zero.

I have 2 options, 1. Replace head gasket, get a valve job or 2. Buy a used engine.

Please, I need some help.