I have recevied a very informative replies against my query ... i am posting one from alikhan7. I hope it will help you all .......
I kept Passo for 6 months and i would recommend you fallowing based on my experience
1- Caltex Havoline engine Oil
2- Toyota 1KRFE Oil filter Original available from 3S
3- Toyota T4 transmission Oil make sure filter service is done
4- Brake pads are different from VITZ but available in local market don't change unless required i recommend brake service from Toyota 3S
5- Toyota 1KRFE Original air filter available from Toyota 3S
6- Any good Mechanic I guess Toyota 3S other mechanic can ruin your car
Get Throttle clean for better fuel average,don't replace STOCK rims
for tyre size / air pressure fallow instruction on right door panel
if you want to change tires possible combinations are
155/80 30 front , 32 Back
165/70 29 front ,30 back
175/60 28 front , 28 back
Passo common problems / faults and remedies
1- If car vibrates while brakes pressed in cold conditions possibly engine
mount rubber touching frame
remedies:replace engine mount
2-If Rattling on bumpy roads due to steering colum play
remedie:can be tight after opening steering assembly cross
3- Brake sound ,remedies: it's Normal avoid it.
4- AC not cooling at Idle speed.
remedies:increase RPM up to 200