For those of you that have no waranty..like myself.
Here is the solution, remove the tensioner. For this you have to remove the left side engine mount, just put a block of wood under the oil pan and lift with a floorjake.
You can safely lift the engine 2~2.5 inches. you will need this clearance to remove the long bolt holding the tensioner. Now once removed, put the tensioner on a vise. Remove the bolt holding the pulley. It is a special socket but a pipewrench (small) works wonder. It is not that tight!
now that you have the pulley in hand, you see that the bearing assembly is molded inside the plastic. So just remove both rubber seal (dust cover) off the left and right side of the bearing. Be carefull not to damage them, they just pop-off with a small flat screwdriver.
Now clean out the old grease, and repack the bearing with a quality grease. I used Mobil High pressure grease. Re-install the seals, tighten the pulley on (same pipewrench), re-install the tensioner and belt then lower the engine back down to install the motor mount. total work hours 2.
I've put on 15 000 miles and no noise. I also sugest installling a new belt while you'r at it.
AND STAY AWAY FROM THAT BELT SPRAY THEY SELL AT THE AUTO STORE.
Ask if you are in dought.