The transmission fluid found in a Mitsubishi should be replaced between 15,000 and 30,000 miles, depending on your driving style. Since a transmission is more probably to undergo a hefty amount of strain in highly polluted locations, it is possible that thickened sludge and harmful particles would penetrate your transmission closer to the 15,000 mile-mark. Vehicles that typically drive less busy roads in suburban areas should be stretched to every 30,000 miles for a routine transmission fluid replacement. Either way, if you are familiar with operating on vehicle and have the necessary tools, replacing your own transmission fluid can be performed in an hour’s time or less.
Get your transmission fluid ready for drainage by driving your Mitsubishi for at least 10 minutes before starting. This will heat the transmission, letting the fluid to drain more entirely.
Elevate your vehicle at least 6 inches off the ground using a vehicle jack, so that you can carry on your project comfortably underneath it. It is extremely vital that your vehicle is evenly elevated so that the transmission pan isn’t tipped when you take it out.
Support the jack using four jack stands next to the inner side of each tire before getting under your vehicle.
Put your drip pan beneath the transmission pan under the front of your vehicle. The transmission pan on a Mitsubishi is found at the underside of your transmission, closer to the driver’s side front of the vehicle.
Uncap the drain plug at the center point of the transmission pan. Beware that hot fluid will pour out, so stay physically clear of the transmission pan as soon as the cap is let out. Your drip pan on the ground is meant to catch the draining fluid.
Have your 17mm socket wrench to unscrew the other bolts from your transmission pan after the fluid tends to have stopped dripping from the transmission pan.
Discard any leftover old transmission fluid from the floor of the transmission pan unto your drain pan.
Clean the transmission pan with the help a small amount of degreaser on your shop rag. Any old fluid left over in the pan could contaminate the new fluid, so it is vital to wipe the pan thoroughly.
Change the transmission pan by screwing the bolts back into position using your socket wrench.
Remove the four jack stands and lower your vehicle back to ground level using the vehicle jack.
Uncap the fill plug on the top of your transmission and put it aside.
Put your funnel into the fill plug to prevent unnecessary spills.
Include the first qt. of transmission fluid, using caution not to let it squirt out of the bottle too fast.
Start your engine with your emergency brake engaged.
Shift your Mitsubishi into each gear with your foot on the brake pedal in order to push the fluid through every part of the transmission.
Pour the second qt. of transmission fluid into the funnel and fill plug. The engine should still be running at this point and the emergency brake should still be all the way to the floor for safety purposes.
Place the transmission into every gear again, encouraging the fluid to pass through the transmission system.
Inspect the transmission fluid level using a screwdriver to make sure that the fluid has gotten to the top of the transmission. Mitsubishis do not typically come with a dipstick, but as long as the fluid is not overflowing, it is not too full since the level will go down a bit after the first couple drives.
Change the fill plug cap and close the hood of your car.
You can now let go your emergency brake and turn your vehicle off. Your Mitsubishi transmission fluid is now good to drive for at least another 15,000 miles.