OK so I'm a complete novice when it comes to fixing anything mechanical but am going to try to change the rear diff oil in my Disco 300 tomorrow.
I've bought 3 litres of the special EP80/90 oil from Halfrauds (at £9 each litre!!) but am guessing I should try and flush it a bit as it sucked muddy water in through the breather tube.
Plan is to drain it first, then add around half a litre of the new oil, drive a few hundred yards slowly, drain again then fill to the recommended
2.7 litresAny other tips?.