jamesmartin said:

anybody thats worked in a lr dealer or independent will have changed auto oil as i described, its std practice and works boxes if serviced are out lasting the chassis,changing one a year is at least half of lrs recommended mileage,if you want t flush /fill thats up to you,

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your missing the point I don't flush ..I only replace the oil so if I take 8 litres out 8 litres goes back in.... if i want to flush i will remove 20 litres and 20 litres goes back in for what it costs that extra 4 litres of oil is a piece of mind

you are also missing the point its not just transmission your servicing ..maybe premature TC failure considering this creates allot of heat