hello and welcome to TAI Mr. Shenoy . it is great to hear that you are a proud owner of Maruti 800 from past 19 years, and you maintainedi it well.
All the services and replacement of parts is good but about the engine flush , MASS guys were right. engine flush is not recommended for old vehicles and your car is almost 20 years old. i wish you will not face any engine problems shortly. And now about the tyres , your tyres are 10 years old , although your usage is less and there is not much wear and tear , but still rubber of tyres may have lost it's strength and shape. but if all of them are in good shape you can get the wheel balancing done from another place and drive your car happily. you can get new tyres when your budget permits.. if tyres have cracks on sidewalls or bulges , you should replace them as soon as possible for your safety.
All the services and replacement of parts is good but about the engine flush , MASS guys were right. engine flush is not recommended for old vehicles and your car is almost 20 years old. i wish you will not face any engine problems shortly. And now about the tyres , your tyres are 10 years old , although your usage is less and there is not much wear and tear , but still rubber of tyres may have lost it's strength and shape. but if all of them are in good shape you can get the wheel balancing done from another place and drive your car happily. you can get new tyres when your budget permits.. if tyres have cracks on sidewalls or bulges , you should replace them as soon as possible for your safety.