Transmission type 2003 Outback

What is the difference between a L4 and S4 transmission on a 2003 outback 4 cyl 2.5L, auto? Should it be mantained any different? Thank you!

Follow the transmission maintenance recommendations in the owner’s manual.

If you don’t have an owner’s manual, get one. might be a good source for an inexpensive used owner’s manual.

Many mechanics recommend replacing the transmission fluid every 30K miles even if the owner’s manual says you can go longer.

It’s not a bad idea.