Hello gentlemen, I am new here and first my apology if i posted this may be in the wrong category. I just bought a 2012 Isuzu Dmax 4x4 from the dealer. After 3 days, my brother-in-law inspected the engine and probably without carefully returning or recaping the engine oil cap after travelling around 30 kilometers with a 60 to 80 km/h speed when we reached home, we found out that the engine is smoking and oil splatting everywhere in the engine. The engine oil cap is not closed. Here is my questions please my apology as i might ask the wrong questions here but please and kindly provide answer if it is near to what i meant.
1. according to my brother in law he filled in 8 liters to the engine. does this mean that there was none left?
2. does that incident already inflict damage to the engine?
3. is there something that i need to worry or have to do or should i bring it back to the dealer for check-up?
4. granting the distance we travel based on the distance, the overheat indicator did not light including the oil and the pressure or whatever dashboard lights have indicated a warning during the drive, does this mean that the engine is ok?
5. after filling the engine, we did not have another drive as may be there is something serious we dont know. how can we tell if there is really a problem due to that oil spill?
6. lastly, if the cap is removed, does the engine usually eject the oil?
Thank you very much guys in advance for your answers and expert's advise.