GL-4 Gear Oil

GL-4 gear oil is formulated for manual transmissions and transaxles that use yellow-metal synchronizers, where the milder extreme-pressure additive package of GL-4 prevents synchro corrosion that GL-5 oils can cause. This collection covers MANNOL and FANFARO's full GL-4 range from the semi-synthetic MANNOL 8101 (75W-85) and mineral-based options like MANNOL 8107 and FANFARO 8701 (80W-90), through to fully synthetic choices such as MANNOL 8109 and FANFARO 8710 (75W-80) for wider temperature tolerance. Both brands manufacture to API GL-4 standards in Germany, so viscosity and additive consistency stay batch-to-batch reliable, important for gearboxes with tight synchro tolerances. Check your vehicle manual for the exact viscosity grade before ordering, since GL-4 gearboxes are viscosity-sensitive in a way engine oil isn't. All listings here are sourced as genuine imports, not repacked stock.