You surely travel a lot clocking 79,000km in less than 3 years. When I sold off my previous car after using it for 5 years 1 month, the mileage is only around 51,000km.

Sorry to hear about the engine problem in your Preve Turbo. No such problem with the engine yet (touch wood) but the transmission in my car, also a Preve Turbo is acting erratically weird these days with an occasional loud "woo woo" sound coupled by rough jerky acceleration which I think is due to the Synthium 1000 engine oil. Other than the CVT performing under expectations, no major issues.

Since your car is still under warranty, just let the service centre fixed it. You don't need to worry about the "solution" since the SC will fix it for you, though you can ask what might have caused the engine problem or the leakage. Whether it is due to wear and tear or something else.