I have an olds 88 1996 and the coolant is leaking into the oil and smoke is pouring out the back iv'e been told that it might have something to do with the manifold but i don't know a whole lot about engines... my car wont even turn over any more
On top of your intake there is a plastic plenum, (its huge and plastic, directly on top of the engine you cant miss it) they are notorious for cracking and allowing water to leak into the engine and your oil, replace it and change your oil and spark plugs and you should be good to go, the plenum is about $140 with all the gaskets, (at advance auto) it will take a couple hours to replace.
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Black smoke is usually excess fuel, that can be caused by things such as leaky fuel injectors, bad coolant temp sensor, weak spark (bad coil?). You don't say what year or engine. If a carburetor, it may need overhaul. If excess fuel gets really bad, it can wash the oil off the piston rings and cause rings to wear, plus dilute engine oil causing bearing failure.
White Smoke is coolant being burnt,usually from
a failed head gasket
The motor overheated & pushed out the freeze plugs
They told you different things for several reasons
They don't have your commitment to leave it & part with your money
They have little experience themselves
They or the shop does not want the job (my guess)
They can not make money on a job that will last a week or more
They won't tell you that you have a job coming costing you $3,000
The motor may have to come out for the freeze plug issue
The head gaskets may have to be done
White smoke out of the exhaust means a coolant leak in the engine. When you accellerate hard and get that it could be the head gasket is leaking. The bad thing is that coolant leaks can ruin the catalytic converter too. You are looking at several thousand in repair bills.
Valve stem seals can cause this problem, but normally only when first started. Oil in the rocker cover seaps through the oil seals into the cylinders and is burnt up on start up. Try a "STOP A LEAK" additive and it may reduce the oil consumption and smoke. I found some on e-bay and it worked on my tired old escort. It even stopped the rattling tappets.
The smoke is obviously a big indicator you have oil in the combustion chamber. On turbo motors it is likely coming from a leaking oil seal in the turbo housing itself. But there is a possibility of internal damage like a piston. Might want to run a compression test to eliminate any internal engine issues first, then focus back on the turbo oil seals.