Normal
By the way, it is very common for N52 engine to top up 1 liter of oil at every 7,000 kms to 8,000 kms of traveling. It is the engine oil sensor that monitors the level of engine oil. So, when it detected a drop of oil level, it will alert us for topping it up. If you don't want to see the appearance of indicator to top up oil, then it is recommended for you to do an engine oil change or service at every 7,000 kms to 8,000 kms interval. Do not follow the 25,000 kms service interval which I personnally discourage it.
