54, do you have the shop manual? It will tell you everything you need to do in the off-season storage section, and it will eliminate conflicting information.
To answer your question directly, yes. You do need to fog the engine. Specific 4-tec steps from the manual follow.
ENGINE LUBRICATION
4-TEC Engines
Fogging of the engine is recommended at the end
of the season and before any extended storage
period. This will lubricate the intake engine valves,
the cylinders and the exhaust valves.
To fog the intake engine valves proceed as follows:
– Remove the two bolts that hold the fuel rail on.
– Remove the rail along with the three fuel injectors.
– Apply BOMBARDIER LUBE lubricant into the
intake ports.
– Crank engine at wide open throttle to prevent
fuel injection and ignition.
– Reinstall the injectors.
CAUTION: Install new O-rings.
– Torque the two bolts that hold the fuel rail on.
WARNING
At preseason preparation, ensure to perform a
fuel pressure test and ensure there is no leak.
Also run engine and check for leaks. Refer to
ENGINE MANAGEMENT section.
Pull engine cover upward to remove it.
– Disconnect ignition coil connectors.
WARNING
When disconnecting coil from spark plug, always
disconnect coil from main harness first.
Never check for engine ignition spark from an
open coil and/or spark plug in the engine
compartment as spark may cause fuel vapor
to ignite.
IMPORTANT: Never cut the locking ties of coil
connectors. This would allow mixing the wires between
cylinders.
– Remove ignition coils.
CAUTION: Ensure there is no dirt in coil holes
prior to removing the spark plugs. Otherwise,
dirt would fall into cylinder and will damage the
internal components.
– Remove the spark plugs.
– Apply BOMBARDIER LUBE lubricant into the
cylinders
– Reinstall spark plugs and ignition coils.
– Reconnect ignition coil connector.
NOTE: Prior to inserting the ignition coil to its location,
apply some BOMBARDIER LUBE lubricant
around the seal area that touches the spark plug
hole. After installation, ensure the seal seats properly
with the engine top surface.
– To reinstall engine cover, push it downward until
it snaps.
– Crank engine several times while keeping throttle
fully depressed.