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I do not know the answer to your problem but I will tell you something that I found odd. Oil. You are using a heavier oil (5W30). I know what you are thinking, a thicker oil must protect the engine better since its more resist to heat right? Well, it is also harder to lubricate the engine with it. There is a post in this forum with some tests results trying different oil types. Short answer, use 0W20, always. If you need extra cooling, get an oil cooler, dont put a thicker oil in it. Also, I lived in Chile for 7 years, I know gas can sometimes be really crappy, 98ron is the bare minimum the car needs to run and can sometimes cause knock (early detonation) if quality isnt top notch. I think you may have a combination of a worn down engine (oil possibly) and very shitty gas.
Im affraid the mechanics wont probably find anything wrong with the car and you will be left hunting unicorns. Try an octane booster as suggested earlier in the thread and also try going back to the stock 0W20 oil (and always synthetic, that shouldnt even be a question, you shouldnt even need to mention it).
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