Oldsmobile 1998 Silhouette Owner's Manual page 21

Adjusting the Split Bench Seats
There are two adjustment levers on each section of the
split bench seats to adjust the seat forward or rearward.
They are located below the center of each section of the
split bench, one in front and one in back of the seat.
Lift up either lever and
slide the seat forward to
allow for extra storage
behind the seat, or slide the
seat back to allow extra
room for passengers.
Release the lever. Push and pull on the seat to be sure it
is locked into place.
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