so i basically got screwed over on my most recent car purchase my poor 300E runs preaty bad i dont know what to do all the cylinders have perfect compression 120psi each but the thing leaks oil everywhere and the spark plugs are covered in oil and are so gunked up and black that the thing runs real bad. about a week ago i started up the car, let it sit in the driveway for about 1/2 hr and then reved up the engine and the car started smoking sooo bad and i had to drive it about a mile before it would stop. any ideas help?

Smoking from under the hood or out the exhaust? From what it sounds like you have alot of oil leaks and you will be smoking from under the hood.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

im preaty cert en its the head gasket the sparkpulgs closest to the fire wall are cleaner then the ones away the middle one was the worst it was totally caked with crap and the smoke is coming out of the exaust

Most likely would be valve guides/seals on a 103 engine.

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A Dalton

geez i dont even know where to start

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I'm pretty certain it's not the head gasket.. if the sparkplugs
are oil fouled , the valve seals would be my first suspect.

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A Dalton

The first thing you need to do is make sure the oil is topped off. Then you need to soak the motor down with a good degreaser and pressure wash it. Then you will be able to tell where the oil is coming from.

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'85 300SD (formerly california emissions)
'08 Chevy Tahoe
'93 Ducati 900 SS
'79 Kawasaki KZ 650
'86 Kawasaki KX 250
'88 Kawasaki KDX200
'71 Hodaka Ace 100
'72 Triumph T100R

120 psi doesn't sound perfect to me It sounds low. I would guess the seals are gone valves most likely have oil cake on.

Run conpresson test again and swirt oil in cylinder and run test again. if pressure goes up most likely rings are worn if pressure stays low you got valves not seating good.

yeah that makes makes sense it leaks oil from every where i have done the wash it off thing and it leaks from the valve cover gasket, it leaks from everywhere like right above the exaust i will get some pictures

Valve seals, probably valve guides, rocker cover gasket. Potentially rocker cover is distorted and will not seal properly.
The rocker cover is fastened down to a relatively low torque - and tightened with a specific method.

Leaking oil from the rocker cover onto the exhaust causes an uncomfortable burnt oil smell to invade the cabin ....... ask me how I know.

im selling the car for 1000 it has 18 inch AMG rims nice maroon paint job limo tinted windows interior is in decent condition the car is located in grass valley california

Why not spend a few hours and $50 putting new valve stem seals. This is like the 2nd or 3rd recommendation to do so. You'll be amazed.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

really.. i thought it would be really complicated and expensive to do that im kinda scared about working on the upper end of the engine but if its just that i would be amazed should I buy a manual so i dont mess anything up?

I changed valve stems on my Mitsubishi Eclipse using the rope method. Basically just before the cylinder gets to TDC you fill the cylinder with rope then turn engine at crankshaft and the piston pushing on the rope holds the valves from falling when you remove the valve springs and replace the valve seals. You will need the correct valve spring compressor from Mercedes still.

really.. i thought it would be really complicated and expensive to do that im kinda scared about working on the upper end of the engine but if its just that i would be amazed should I buy a manual so i dont mess anything up?