A nice old dirt bike has found its way here with a bad water pump seal, allowing most of the coolant into the gearbox. Other than changing the oil multiple times & running it in between oil changes until it comes out clean, is there a more efficient way? Just wondering if there is an alternative to wasting the oil as I'll have to let it sit forever to separate so it can be recycled & how its done if it happens to a really big industrial gearbox. The first change came out looking like a milkshake even after sitting overnight. Plain SAE 30 is specified in this bike, at least its not the usual gear lube that would be 3x the price. It has a wet clutch.