under the intake manifold you have to remove the engine cover to get to it.
Oldsmobile didn't make a Cutlass Supreme in 1998
Which engine?
The 3.4 liter V6 engine in a 1998 Oldsmobile Silhouette has a timing CHAIN
To access the spark plugs in a 1998 Oldsmobile Delta 88, first, open the hood and locate the engine. Remove any necessary components that may obstruct access to the spark plugs, such as the engine cover or ignition coils. The spark plugs are typically located on the engine's cylinder head, so you may need a ratchet and socket to remove them. Ensure the engine is cool before starting the replacement process.
Follow The TOP Radiator Hose From Radiator To The Engine. Where It Is Clamped On Remove The Hose. Behind The Housing Where You Removed The Hose Is The Thermostat
Remove the lower radiator hose.
4.6 US quarts
Front, drivers side , below engine
Remove fuel tank for access
Exactly 7 litres
On front cover of engine by crankshaft pulley.