Use the right oil because it has all the correct additives and as the seals in my box leaked last year I know how important it is that you have the right oil in there.
I don't really know how long mine had water in but the gears were perfect despite having very milky oil/water.
I buy the Sierra oil from Keyparts and have a small pump that fits on the bottle, its really easy not a lot of cash to do it this way.#
Small but important point is to replace the drain plug washers with new ones at least one a season as even a small leak seems can allow water in and they only cost a few pence.
Originally Posted by TRevor Lawson
Hi ,is the ep 90 gear oil used in the lower leg on out brds any different to ep 90 used in car axle's,? it is more expensive, .
thanks , Trevor