From what I know, the previous servicing done by Mitsubishi used only 10 litres.

I've tried to get my mechanic to do it for me with 10 litres of tranny fluid but he told me to do a proper flush you need minimum of 20 litres of tranny fluid!

Anyone knows what's the amount needed to do a proper flush of the tranny?

I've done it with 10 litres before to my old TP gaybox auto.. was soo much smoother and quicker in every way after that

Maybe Mal can field the official answer :)

I bought 15 litres and used about 11. The book says to repeat the flush procedure till you are happy with the colour of the oil - mine looked pink after 11 however I'd imagine if the oil was black it will take a lot more as the new oil is mixing with residual dirty oil.

I have 10L ready to go, what is the procedure you follow?

10 - 15 for a dirty trans

This is the procedure I followed:

With the ATF at normal operating temperature, replace the
ATF using the following procedure.
1. Remove the right hand hose connecting the transmission
oil cooler pipe to the oil cooler (built in to the bottom
of the radiator).
2. Connect a suitable length of hose from the radiator cooler pipe to an oil drain receptacle, large enough to hold the
quantity of discharged fluid.
3. Start the engine and discharge the ATF. Operating conditions: “N” Neutral gear and idling.
Caution Start the engine and then stop it within one minute. If the ATF is discharged before the one minute elapses,
stop the engine at that time. Amount of ATF discharged: Approximately 4.5 (litres)
4. Remove the drain plug at the bottom of the transmission case and discharge the ATF. Amount of ATF discharged: Approximately 1.0 (litre)
5. Install the drain plug and gasket, applying the specified amount of torque. Tightening torque: 32 Nm
6. Fill with new ATF through the oil filler tube. Amount of ATF added: Approximately 5.5 (litres)
NOTE Stop pouring if the entire amount of new ATF cannot be added. (Do not exceed “COLD” level)
7. Repeat the procedure in step (3) and discharge approximately 3.0 litres of ATF.
NOTE Check the ATF discharged in step (8) for contamination. If it is contaminated, repeat steps (7) and (8).
8. Add the new ATF through the oil filler tube. Amount of ATF added: Approximately 3.0 (litres)
9. Attach and secure the hose that was disconnected in step (1) and securely insert the oil level gauge.
10. Start the engine and let it idle for one or two minutes. 11. Move the selector lever through all gear positions, ending
in Neutral position.

This is the procedure I followed:

With the ATF at normal operating temperature, replace the
ATF using the following procedure.


awesome, looks like something i'll be doing in the next week or 2, my tranny fluid is black, not a hint of red in it, still shifts ok though? :-)
seems easy enough

question though.. mine's a TH and it has an AT external filter... at which step do i remove the old and replace the new one?

I think the amount needed also depends on equipment. My old mechanic refused to do mine and would send them out to a place with the proper machine, otherwise he would need too much fluid to flush the system.

Back to Mitsubishi then...

Back to Mitsubishi then...

You must be rich....but if not then I'd still persist with doing it yourself. Download the workshop manual for your series Magna from this site which is where my info came from. It will list the actual procedure although I would say it is very similar to what I posted with the addition of changing the filter. If your oil is black you will probably need that extra 5 litres of oil.
I'd allow about 4 hours max to change the trans oil, and that's triple-checking everything and being very anal.....why pay Mitsu.

They quoted me $210 to do the gearbox flush, and about $420 to do the timing belt. Nothing wrong with those prices, and as I work 11 hour shifts overnight, I can't be stuffed trying to do it myself!

Plus, all my tools are in Hobart and I'm in Adelaide!

They quoted me $210 to do the gearbox flush, and about $420 to do the timing belt. Nothing wrong with those prices, and as I work 11 hour shifts overnight, I can't be stuffed trying to do it myself!

Plus, all my tools are in Hobart and I'm in Adelaide!

They are very very good prices - they barely cover the cost of oil and parts. Good Luck.

when i last did my TH i bought 3 large cans of Castrol & used 2 1/2. Left about 2L for future topup.


question though.. mine's a TH and it has an AT external filter... at which step do i remove the old and replace the new one?

doesn't really matter, when engine is not running its not pressurised :)
Its already upsidedown so its gunna make a mess whichever way or time you do it.

I just swapped it before properly refilling with new fluid.

They quoted me $210 to do the gearbox flush...

paid ~ same back in 2005 @ local dealer to do it for our KJ

they've got a wheelie pump gadget that pumps the fluid into the dipstick hole whilst collecting what flows out

i suspect the fluid is filtered & recycled during the flushing phase; i *hope* "fresh" stuff gets put in for the final fill ;)


Some dealers used to have a display with samples of fluid @ various levels of redness all the way to sooty black.
I always thought they were there for scare tactics until i collected my own samples... yeah they CAN get that black
if you wait till 100,000 intervals.

paid ~ same back in 2005 @ local dealer to do it for our KJ

they've got a wheelie pump gadget that pumps the fluid into the dipstick hole whilst collecting what flows out

i suspect the fluid is filtered & recycled during the flushing phase; i *hope* "fresh" stuff gets put in for the final fill ;)


Some dealers used to have a display with samples of fluid @ various levels of redness all the way to sooty black.
I always thought they were there for scare tactics until i collected my own samples... yeah they CAN get that black
if you wait till 100,000 intervals.

I've seen transmission fluid totally black after 30,000kms. It all depends how the car is driven.