NOTE: Do not overfill the transmission. An electronic fluid level sensor, available on some vehicles, provides a convenient means of checking the transmission fluid level. allow the engine to idle and observe the transmission warning lamp for 30 seconds. If lamp remains OFF, it is not necessary to proceed further. If the lamp glows, the fluid level should be checked manually.
Check the automatic transmission fluid every 30,000 miles (48,000 km). The fluid level in these units is very sensitive to heat and must only be checked when the unit is at normal operating temperature. Drive the vehicle until a few miles after the engine has reached operating temperature. Then, with the engine idling, engage every gear selector position for a few seconds. Finally, put the gear selector in the Neutral position and securely engage the handbrake.
Remove the dipstick, wipe it, reinstall it all the way, and remove it again. Fluid level should be between the two marks on the stick. If the fluid level is at the lower mark, gradually add one pint to bring the level even with the upper mark on the dipstick. Do not overfill the transmission as this will cause foaming of the fluid and operating problems.
You should add Dexron® II automatic transmission fluid only. Turn the engine OFF and add the fluid with a small funnel through the transmission dipstick tube. Mitsubishi recommends against the use of any transmission additives whatsoever.