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I don't think you can change it. I have a 1999 catera and my transmission fluid has to be changed at the dealer.
See the related link below for step by step instructions with pictures on how to change the transmission fluid in your 1999 MB E320.
Check transmission fluid level Perhaps change transmission fluid and filter
its on the transmission it self no dip stick take it to a place where they change transmission fluid shop
4.5 quarts
You have to remove the pan if there is no drain plug
Check transmission fluid level (auto) Change transmission fluid and filter (auto)
you change the manual transmission fluid in a '99 cavalier simply by removing the transmission drain plug and allowing all the fluid to drain then replace the plug and refill with Syncromesh transmission fluid(that is the fluid recommended by Chevy for use in your transmission) It should take 2 quarts.
Change the fluid and filter every 36,000 miles.
Remove the transmission oil pan for access to filter
i don't think there are si automatic only 5 or 6 speed Manuel transmission
Transmission fluid is inside the transmission.