It does not contain oil. It contains Transmission Fluid. Pay someone to do this. Very nasty DIY job.
Remove transmission oil pan for access to filter. Replace pan gasket, fluid and filter
Remove transmission oil pan for access
what do I need to change the 1997 Plymouth voyager transmission oil
Add automatic transmission fluid through the dip stick tube. No kidding!
It uses ATF+4.
It doesn't have one but they can check the transmission fluid at any place that does oil changes
Remove the transmission oil pan for access to filter
Time for an oil change.
Remove transmission oil pan Replace fluid, filter, and gasket
Generally 10W-30 is a good oil for most vehicles.
How do you change ML55 transmission oil?
I recommend you have the A/T fluid changed every 36,000 miles.