Engine Performance problem
1991 Other Nissan Models 4 cyl Front Wheel Drive Manual 200000 miles
The engine has been running low on oil and i've been out of town and let someone use it. They said that when they drove it it would run a kittle hot but when I checked the coolant level it was fine. Needless to sasy they didn't check the oil level and when I got it back I put two quarts of oil in it.I guess that wasn't enough. Right after I put in the oil about 50 feet later there was a constant cloud of white smoke coming from the exhaust. It is now full of oil but still the heavy smoke and the coolant level is still good. What should I check for and possible need to replace?