Autobahn 8

I have a question for you guys. I see that in North America Mazda warranties the motor 8 year 100,000 miles. Is this for just North America? I'm in Taiwan. My motor failed in Jan and I've since gotten a new one, and it was expensive.... cost around US$9200 to replace...I guess due to high import tax. The old motor started to have weird clanking sound during high RPMS (also would stall) after owning this new car. Gone back to the dealer many times but always could not solved the problem, seems I was losing compression so getting and oil change would solve the problem for a little while then at around 2500km the oil would die. Anyways it's since been out of warranty. MaZda tells me the car and all its parts are warrantied only 3 year 60000km. Is this true? Why are the warranty coveraged so different?

My other question is I used to have that chirping noise when the oil was going bad. Once the oil was replaced the sound went away, until finally no matter what I did even after replacing the oil the sound stayed. With this new engine I am hearing slightly that sound again after about 2Km...sort of coming from the front right side of the car? Can anyone tell me what it is? I've always used mineral 5W50 Mazda oil due to high temp in Taiwan. What should I do? I'm afraid the old problem is coming back again. The oil level seems fine and not watered down, compression seems ok..... so I have no clue.