Quote:
Originally Posted by Tannaton
Change it.... if it was the engine oil, you wouldn't think twice...
There are some concerns when changing very old fluid that doing so can dislodge debris, but no-one has ever posted on here where that has happened to them.
You can mitigate the risk of this by "sump dumping" - i.e. remove the drain plug and around 3 litres will come out, do that, refill with new, drive the car a few hundred miles and then repeat. Doing that 4 times will get you around a 94% fluid change. You will notice the difference and your gearbox will be very grateful.
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At 100k miles I decided to change the ATF. Did the first sump dump and drove around 500 miles and the difference was amazing.
Did the second sump dump and didn’t notice any difference. Two weeks later my transmission flared and I have had problems ever since.
I’ve had the level double checked and it’s correct.
I’m now at 140k miles and the front transfer box needs replacing.
Refurbished transmission + transfer box = £3k+ so essentially my car is beyond economical repair.