2018 Haval H6 is losing engine oil

Any time an engine starts to lose engine oil, it’s either going to be because of a leak somewhere or because there’s wear or damage inside the engine. A mechanical workshop should be able to carry out some fairly simple checks to rule out either possibility. In the meantime, use the vehicle sparingly and keep an eagle eye on the level of oil on the dipstick. Running the engine oil too low is a sure way to destroy the engine, when the fix might have been a simple leak.