E 320 (V 6 petrol) Oil level increases minimally

Hello forum, I have a question: With my E 320 T V 6 (i.e. petrol engine) with approx. 191 000 km from ́01 it seems to me that the oil level will increase minimally in very small quantities. At perhaps 14 000 km approx. one and a half to two millimeters (not centimetres). The vehicle does not consume any coolant, smokes and steams out of the exhaust, runs very well, does not need a bit of oil. I drive about 20 % city, otherwise only on long distances AB and highway (approx. 200 to 500 km with bet still the oil smells a little bit like gasoline, but it actually has it quite easily with all my cars, even if I drove in the year 40 and 50 tkm. Are the injection nozzles leaking very easily, or is the oil level only now in the summer (would be an explanation for me) higher by considerably higher oil temperatures (even at 30 degrees and sharper driving) than in the winter or do I just worry too much? The next Assyst B would be in 2100 km. I look forward to your answers! Many greetings Daniel