For what it's worth, the car which preceded our Mirage was a 2006 Series 2 Colt with at JATCO F1C1 CVT. We did 200,000km in that with no problems at all and the trans was operating just as well the day we sold it as the day we bought it. Bear in mind that the Mirage trans is different from the Colt, at very least in that the Colt didn't have the two speed back end.
I did make a point of changing the Colt's CVT fluid twice, once at about 60,000km using Mitsi's hideously expensive Diaqueen ATF SPIII fluid at about $nz27 per litre, four and a bit litres needed for a drain and refill. After the trauma of that cost I did a lot of research on compatible aftermarket fluids and finally settled on a Fuchs product which by memory came in at less than ten bucks a litre. This went in at about 150,000km and obviously didn't hurt the trans over the next 50,000km so I figure it must be OK. Legend has it that if you put the wrong fluid in these trans, they will crap themselves very quickly.
At risk of offending a very worthy company, I did get quite warm on a Penrite product ATF MHP MULTI VEHICLE SEMI SYNTHETIC AUTO TRANS FLUID which their website recommended for 2004 onwards CVT equipped Mitsubishi Colt. On the fluid pack however is the warning not to use this in CVTs. Happily I noticed this before loading the oil, and sent it back. Which recommendation was correct ? I would rather not find out in one of my cars.
The Colt workshop manual specified something like ten litres and said to do a flush with the first five, then load the second five for service. For a variety of reasons I chose instead to feed a pickup hose to the bottom of the filler tube and use a suction tool to pull as much old oil (and hopefully any gunge) out of the bottom of the trans fluid pan. After a few months' service the new stuff still looked clean, so I think that method must have fairly effectively got rid of the majority of the old fluid etc.
So has anybody identified an aftermarket trans fluid which is safe to use in the Mirage ? Alpha One kindly posted that the manual specifies Mitsubishi CVTF-J4 for the Mirage CVT which is at least a different name from that specified for the Colt - is it really a different fluid or just a bit of re-badging to keep us guessing ?
Whatever, JATCO seem to know what they're doing with CVTs and given good care I would be confident of a long life from the Mirage's unit. I certainly would never hook a trailer up behind one though. Maybe it would hack it, but I wouldn't look to find out.
Regards
Flange