I had one of my driveshafts out last weekend to change a split CV boot, when i pulled the shaft out obviously gearbox oil started leaking out. The oil was only topped up in the gearbox about 3 weeks ago when the engine was fitted, and it was proper red vauxhall oil. The stuff that was leaking out when i removed the driveshaft was like a muddy brown/redish colour. it looked like muddy water. is this normal? It didnt look like the oil i put in.
Im wondering if i should do a complete gearbox oil change.