It is important to know where to add the proper fluids in a car. A person can add transmission fluid into the transmission dipstick tube of a 1999 Tacoma 4x4.
It does not contain oil. It contains Transmission Fluid. Pay someone to do this. Very nasty DIY job.
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 socket head plug located next to the oil dipstick knob and observe the level on the dipstick attached to the plug. If necessary add transmission oil thru that same hole.
Remove transmission oil pan for access to filter. Replace pan gasket, fluid and filter
Through the cap in the middle of the valve cover.
I recommend you have the A/T fluid changed every 36,000 miles.
Were is the plug to put transmission oil for 1999 a6 audi?
If you mean transmission oil, you don't add any. The transmission is sealed, it never needs oil.
In the oil pan
Inside the transmission oil pan