shutterbug

What kind of car you have and what was the mileage at your last change?

Transmission fluid, you don't need to change that often, not as often as engine oil though.

Guideline: 6000km/or every 4 months whichever comes first.  This is for typical cars.

shutterbug

I think they screwed up then...now the bigger question is that did they really changed your trans fluid or engine oil last time???

I was talking about 4months/6000km is for engine oil change. Sorry if I confused you.

shutterbug

It depends on what kind of flush you're doing.  If they flush with a machine,  which is the best method, it can almost replace all the fluid inside.  It hooks up to the cooler inlet and return and about 16L of fluid will be push into the tranny as the dirty stuff will be pushed out.

The "drain & fill" type of fluid change like the ones on Toyota is recommended at a short interval because they merely don't replace much fluid, only about 2.5L.

Some GM products, they claim their fluid can last for the lifetime of the car

shutterbug

If your tranny is in poor condition to begin with...don't even bother with fluid change and what not, sell the car ASAP and get another one!  I'm serious.  Nothing can save a tranny besides rebuilding it.