teta,
My 2008 MDX suffered from engine seal failure while was still under warranty (around 48K miles). The seal was replaced by local dealer. About a year later the seal failed again. Still covered under warranty (less than 70K miles), the dealer kept the vehicle for longer time and replaced not only the engine seal but the torque converter seal as well. My car is now 120K miles and I have not had the problem anymore.
If I remember well, at that time, I found several MDX owners complaining about the same problem in different forums. Some where unlucky to have the failure after warranty. If the engine seal is failing, the leak will start increasing.
My 2 cents.