[Tannaton]

You're quite right to be thinking about it, quite a few members on here change the trans fluid (general consensus would be around every 72k for normal driving, 54k or 36k for towing etc.) You will notice improvements, smoother shift etc. It can take a while for the new oil to reach full effect as the gearbox "adapts" to it.

Post 2010MY cars use AW-1/JWS3324 spec fluid. You might have the 8-speed box - but it takes the same juice.

If you're doing it at home, the easiest way is to do a series of 4 or more "sump dumps". Have a search on here... also lots of videos on YouTube.

Key points would be :

- When draining, pour into an old plastic container or similar so you can mark/measure it and replace with the exact quantity of new fluid.

- Drive the car a few miles between dumps (don't just cycle the gears whilst stationary which you see in some videos, this doesn't disturb the oil in the final drive housing).

- When finished, check the gearbox oil level with the engine running and the car stationary on level ground with the gearbox warm (60 degrees, so you can only just touch it for a few seconds).

Each dump will release about 3 - 3.5 litres, so you will need 12-14 litres to complete 4 cycles, that will give you ~ 90% new fluid.

If you really want to go for it, a further two dumps will get you to as near as 100% new fluid as makes no difference.