1st round of fluid exchange (made simple?)

[spannerrash]

100% agree with the Laird. Do your research and plenty of it. A tired old box with high milage and a poor service record could suffer if given too aggressive an oil change.

There is nothing wrong with changing fluid regularly on a good clean box, it will keep it that way. But as the laird has said, changing the oil on a box with a ropy service history may do more harm than good. The fresh detergents may free up crud that may then circulate and cause other problems. Some owners have claimed "clutch slip" after an oil change on an old un-serviced box.

It's a controversial subject. This is one of those rare examples of where you could kill a car with kindness.

I can't emphasise enough. Do your research before going forward. Learn from what others have experienced. This is a D2 killer if it goes wrong.