Yellowish lubricator in the oil refill nozzle

Hello guys, so I have a Fiesta BJ 1991 with 40 KW and am actually very satisfied with the reliability. To my problems: 1. Does he need a lot of oil (about 1l on 1000 km) but in the engine compartment there is little to recognize. Is it bad that he burns it? I just fill it more often… 😉 2. Does he sometimes have a yellowish slime at the place where one refills oil. It may be that this has only happened since when he got a little hot by tearing off the V-belt. but I’m not sure. I’m not from the subject and I’m very grateful for all kinds of help, of course.