Hello Ceedfahrer, since my Ceed is a long-term project, I changed the manual transmission oil at 124,000/6 years times and that was necessary/meaningful: the broth was olive green, with streaks but without chips. Lt. KIA you only have to change with “increased load” at 100,000 km but since I want to drive >200,000 km / 10 years with the Ceed, it was worth me the 15€ for 75W-85 GL4 (KIA wanted 90€).