Ford Taurus smells hot after driving?

I have a '99 Ford Taurus SE, 24 valve V6
It smells hot when we get home from any trips.
I constantly have to check the oil in it.
The car dealer we got it from had a newer engine put in it after it ran out of oil and seized up.
I swear I did regular maintenance to it. 5 quarts of oil burns pretty fast inside a month. Something was wrong with the first engine.
Are these engines notorious for problems? It's the only thing we have ever had issues with on the car.

Sounds like it could be a oil leak? Have you ever seen dripping oil or spots? If that's not it then check your oil filter.