Bro, by the Grace of ALLAH ALMIGHTY, I did not face any problem and it never gave any headache.
Just aik baar mainay 5w-40 use kia tha (instead of 5w-30). fuel efficiency, pick, power almost kill ho gye thi, and iss mein b meri galti thi. I shouldn't have poured that.
Secondly, my car got hit from the back side by a Prius car. Uski thori dry denting karwana pari thi, otherwise, my car never gave me any worries. I just always kept it well-maintained and in top-notch condition, and its working flawlessly.
Last year in winters, it used to give 19.5 + kmpl from home to office and back, and it easily gives 16.5 + kmpl with AC (both figures are for city travelling).
A lot also matters on the person, who drives the vehicle.
Regarding spare parts, I have no idea regarding its prices. ALLAH Pa'ak Ka Shukar Hai, kabhi zrurat nai pari.
Used JDMs are expensive, but offer more value for money. Their build quality, features are matchless, when compared to locally assembled cars.
I would say to either choose between used JDM cars or PKDM Toyota or Honda, Pak Suzuki should be one's last priority when buying a car. Cultus / Celerio and Wagon R kuj behtar hain, but seem quite over-priced.
