I agree Slick 50 if incorrectly added was responsible for blocking engine oil filters, I will not put it (or ANY additive) anywhere near an engine. Manual gearbox VAG products don’t have oil filters and the results I have experienced have been dramatic. I spent £1200 on parts and 40 hours Labour painstakingly rebuilding the 02M for my Octavia to the finest tolerances and would not fill it with anything I did not have complete confidence in. Yes, that is a steel 1>4 shift fork conversion.