Hello people, since there are always so many experts here, say sometimes also an opinion/experience to SLICK 50…, should be an oil mixture with Teflon. Supposedly recommended for the gearbox even. For engine? > in a TDI 1.9 ’95, only (at about 270tkm) 10w40 of FINA/TEXACO/etc. knew. thank you in advance, arno