We recently purchesed a 1993 Mercede 190 E 2.6 and were adding a quart of oil every 500 miles to the engine. 3000 miles later the coolant has alot of oil in it (it looks like mustard) but the engine oil does not have coolant in it. The transmission is full of oil with not water in it and we have never added transmission fliud. Is this a failed head gasket?
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The stop leak most like caused the thermostat to stick closed and caused the over heating which may have blown a head or intake gasket. Have the oil analyzed to see if there is coolant present and if there is you will need to determine which gasket needs replaced. On newer vehicles it's no small job to replace a head or intake gasket os special tools are required.
You seem to have a bad head gasket. Check the exhaust,while running,to see if white smoke is
pouring out.Get it checked out ASAP,since you don't
want to severely damage the engine any further.
The 190 and 300's with the 2.6 and 3.0 l engines have a known head gasket failure (the oil and water passages were too close and the gasket would leak allowing water into the oil), that eventually meant upper engine dissambly at 125 to 150k miles. You didn't say if you have the 4 or 6 cylinder, but check your coolant reservoir for any grey, dark floating gunk. Next, check your oil...is there a brownish foamy looking oil on the dipstick? Not a good sign if so.
With water in the engine's cylinders the car won't start and will need to have the head machined. Sorry, but there is no quick and cheap fix to this problem.
Unless the oil pan is badly damaged then I would not replace it. Tell your technician that you would like the gasket replaced and a new oil plug installed. See if this doesn't change the price to something a bit more reasonable. Hope this helps. Good luck.
You could have a head gasket problem, Check your oil level and see if it's high and also check it for antifreeze. If there is antifreeze miked with your oil it would seam mikly and check your antifreeze level too if it's gone down. Good luck and keep in mind that antifreeze is corrosive the internal bearing in your engine.
It's possible that engine coolant is making it's way into the cylinders (in other words a blown head gasket). I had a Pontiac that blew a head gasket, it was blowing white clouds out the tailpipe. It's a pretty involved job to repair but it is doable by a backyard mechanic. You'll want to check for oil in the coolant and coolant in the crankcase oil. Also do a compression & leakdown test on the cylinders.
When you say you just changed the cooling system what exactly was done and why? Was the coolant flushed and were you getting any symptoms of a problem (such as the engine overheating, etc.)?