Thanks, everyone. Confirmed with VW that the extended warranty can be purchased any time before original warranty expires. So will wait.
If your VW car is manufactured in MEXICO, I recommend you buy extended warranty. Of course, you have to know WHAT is covered, and what is NOT. Sometimes, it only covers PARTS, but NOT labour, if that is the case, HOW much is the labour (usually plus tax close to 100CAD per hour). And to fix VW cars, mechanic may need special tools (like my caucasian co-worker who is a handy man cannot change his beetle front light buld, cost him close to 50 to change at dealer).
Well, good luck (Dealers make most money on maintainance).