Xain bhai where you take your Altis for regular maintenance. It is more than three years that I go to Toyota Islamabad and I am not at all impressed by their service or expertise. Also had a couple of visits at Capital but same story.
But the dilemma is that other than these 3S dealers, I am reluctant to trust anybody in the open market. Can find a good mech, but will never be sure about the quality of parts, lubricants, filters etc.
@Mohzsin. I am using the stock plugs and they have no issues even at 30,000 kms. Just get them cleaned after every 10,000 kms.
MY advice: Never ask for tuning if car is running good, it is most likely that these guys mess up the tunning. I have been doing periodic checks and maintenance regularly, but never allowed them to touch the tuning coz my car is still giving me 14km/lit in city and 17+ on motorway.