FEZZ00

Hi guys I had my car at the tyre shop the other day for wheel alignment I decided to inspect the car underneath . I saw a splatter of black oil on the right side exhaust I located and saw that around the diff cover there is some oil residue / build up still tender soft. I connected that splatter was coming from there . I drive my car very hard it's mostly a weekend car I mainly use Manual mode and enjoy the sound I get since redoing my exhaust

Does anyone have a fix for this and also should I change gearbox oil it was done about 60k service I am now on 92k
I am aware that the oil boils and the cover does expnad but worried and scared