Q: 1. Tag heuer watches are considered to be top quality watches, especially the automatic ones, aren't they? But why do retailers give only a 2-year-warranty for a tag heuer carrera watch? isn't is supposed to be a "life-long" or everlasting model?

2. where can I find a site that tells me more about the inside mechanic of this carrera automatic model? I am not a watchmaker, I just want to know the specialities of this watch.

A: Tag are mostly considered as reliable watches and they have from mid range to very expensive but they are not considered as top quality watches such as AP, Piaget etc. I don't think any watches cames with a "life long" warranty.

You could go to tag heuer home page and find out more about the model you are looking for.

Q: I have bought a Tag Heuer Carrera Automatic watch in the summer, but since then it gains at least 3 minutes in two weeks after having adjusted it. Then I adjust it again, but in two-three weeks it gains a lot again.
The back of it is transparent (there is a glass "window"), and I can see a tiny screw with "+" and "-" signs. that may be the key solution? how does that work, what can be adjusted by that?
If it is so, and suppose the screw is turned towards the "+" sign, then the watch itself will run faster? Therefore, 1 minute won't be 1 minute at all, but will past much faster?

A: The first thing I would try is changing the way the watch is oriented when you're not wearing. On most of my watches, I store the watch crown up. Try crown up, crown down, and face up and see how much time you gain/lose per day. The goal is in the last paragraph of this answer. If you are still outside an acceptable margin, see the next section.

When you first start wearing a mechanical watch, there may be a 'settling in' time where the watch speeds up or slows down. This results in lost or gained time.

When this occurs, the watch will need to be adjusted (regulated in watch terms). This process involves turning the regulation screw (the part you noticed) to either speed up (+) or slow down (-) the watch.

This is an operation that should be done by a certified watch repair person. It involves removing the caseback. If done improperly, you could lose the water resistance features of the watch.

It may be with the shop for a few days as they keep it in a winder and test their adjustments. Its a trial and error procedure.

The goal is to put the watch into C.O.S.C. timing standards. This is a range of -4 or +6 seconds per day.