LAFB Elite | Inshore Fishing Courses Designed For Louisiana › Forums › General Inshore Fishing Discussion › Gear Lube Color › Reply To: Gear Lube Color Boyce Member September 3, 2024 at 8:42 pm Yes lower unit gear lube. Well, it’s green going in and black coming out after a year of use. Just like engine oil I guess. I use Mercury SAE90 for my Mercury Fourstroke 75.
