Hello, I removed engine bottom cover and saw that there is some oil leak. Should i look into it or it's nothing serious? The engine is 1.9 tdi 85kw. The engine almost doesn't use oil, between oil changes (15k) I add about 250-500 ml of oil.
That's a tiny top up for the mileage. I'd clean the area best you can and check on next oil change, unless you find you're topping the oil up more often.