Dark Black Oily Fluid Leaking From Rear Differential Housing: Causes, Costs, and What to Do Now
Dark black oily fluid leaking from the rear differential housing almost always means differential gear oil has broken down and is escaping past a worn or damaged seal, most commonly the pinion seal or axle shaft seal. The color is the diagnostic clue: gear oil darkens to near-black with heat cycling and metal particle contamination […]