Hello. I have the GP 1.4 16v with the 6 speed gearbox. Problem is that the synchros for 2nd and 3rd gear are a bit weak and I have trouble engaging over 3000 rpm (especially in cold weather). They are not grinding but I can feel the difference. So I decided to try another gear oil Redline MT-85 after reading about its ability to improve such problems. After 10000 Km I have to say that the gearbox feels better. My problem is that the specs don't exactly much. Redline is a GL4 while Technyx is GL4 plus. And to make matters worse GL4 plus isn't really an official spec. So do you think I should keep using it or do I risk damaging the transaxle? Thanks in advance.