Hey... I got a used engine put in my car a year and a half ago and a new transmission in October... I have a 94 Saturn SC1... I also had the head gasket on the engine resealed about a year ago...
It's wintertime up here now, and we're getting temperatures overnight of about -5C or so. When I leave the car for about a day, I let it warm up before I drive it, of course...
The other day, I did a long highway drive (about 300 miles/500 KM) and then left the car parked a day or so. I started her up and let her warm up, popped inside the house, and about 4-5 minutes later, I went out to the carpark to find the yard FILLED with white smoke. It wasn't the dark smoke that one typically associates with oil and it didn't smell like it either (knock on wood)... it was thick and white, and kind of just 'floated' there like a cloud.
However, when I FIRST started her up, I didn't even notice. It's only after about a minute of idling in the cold that the exhaust starts to fume out heavily. I also notice a lot of condensation on the pavement where the muffler hits, so it looks like something with water was burning up.
Even stranger, is that after driving a half mile or so, the exhaust stopped heavily churning out for the rest of the night, including when I parked and let it run at idle at my destination 20 minutes later.
Any ideas of what this could be?
Am I possibly experiencing the 'coolant milkshake'? I looked in the coolant, and its pretty solid green, murky, not at all discoloured, as I've heard the 'milkshake' looks like. And it's fairly close to being filled to the top (it's about half an inch to an inch below the top of the reservoir).
Oil level was OK, and clean too (only drove it about 1500 miles since my last change).
After this bizarre behaviour, I did the 300 mile drive again, arrived at my destination problem-free.
Was this possibly just an oddity?
I also replaced my PCV valve last week. I assume I did it right, because it looks pretty straight-forward. I checked it, and it didn't seem loose or anything. Could this be the source of the problems?
I've also recently passed an emissions test (August).
Thanks for all your help. My biggest concern is that I'll get the coolant milkshake...because that always seems to lead to destruction, and I'm not going to get a third engine on this car. The vehicle already has 197000 KM on it, engine gots 120000 KM and tranny gots about 165000 KM.