id worry about the cooling system first after changing the oil and the belts are in reasonable shape (check for cracks/signs of stretching), check the hoses going in and out of the radiator, the thermostat, and the water pump first. if nothing seems out of the ordinary and you're still losing coolant. find out if you're leaking coolant into the engine.

to do so check the inside of your oil cap

if theres a cream-like residue in the cap exhaust gases are making its way into your engine -- your car would also be billowing out considerable amount of white smoke. thats probably a repair that you have to leave to a shop ( and certainly more than $200)

id worry about the injectors and spark plugs after ruling out that the cooling system is working

if you're on a budget with time on your hands, im sure you can figure out all those repairs on YouTube 😏 it may seem daunting but you'd be surprised what you can accomplish with just some hand tools and patience

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Actually My car doesnt have coolant, most Venezuelan use just water in the cooling system

water is fine too 🥳 the coolant system is how the engine stays at a consistent temperature, it uses flowing water from a belt-driven water pump to pull heat from the engine into your radiator. in places where the climate gets to freezing temperature or at altitudes enough to change the boiling point of water, coolant is used instead.

generally keeping your cooling system in good shape brings down the complexity of repairs, it's fine to top off water every now and then but if you're always topping off the cooling system that's not great