Hello MercedesTechs The job is finished on the 104 engine, they did a valve job and replaced the exhaust and intake valve guides, also replaced the front crankshaft seal, rear engine seal, engine oil pan gasket, egr pipe and ignition coil for cylinders 2, 5, due to failure after driving 60 miles(testdrive) Now the car is running very good. I would like thank everybody that sent me messages and advise. RudyBrandes