2003 SUBARU FORESTER catalytic converter

7-2
Starting and operating
Starting and operating
Fuel
Use of a fuel which is low in quality or use of an
inappropriate fuel additive may cause engine
damage.
Fuel requirements
The 2.5 Liter engine is designed to operate using un-
leaded gasoline with an octane rating of 87 AKI or
higher. Fuel octane rating
This octane rating is the average of the Research Oc-
tane and Motor Octane numbers and is commonly re-
ferred to as the Anti Knock Index (AKI).
Using a gasoline with a lower octane rating can cause
persistent and heavy knocking, which can damage the
engine. Do not be concerned if your vehicle some-
times knocks lightly when you drive up a hill or when
you accelerate. See your dealer or a qualified service
technician if you use a fuel with the specified octane
rating and your vehicle knocks heavily or persistently.
Unleaded gasoline
The neck of the fuel filler pipe is designed to accept
only an unleaded gasoline filler nozzle. Under no cir-
cumstances should leaded gasoline be used because
it will damage the emission control system and may
impair driveability and fuel economy. Gasoline for California-certified LEV
Your vehicle was certified to California’s low emission
vehicle (LEV) standards as indicated on the under-
hood tune-up label. It is designed to optimize engine
and emission performance with gasoline that meets
the clean burning low-sulfur California gasoline speci-
fications. If you live in any other state than California,
your vehicle will operate on gasoline meeting Federal
specifications. Gasoline sold outside California is per-
mitted to have higher sulfur levels, which may affect
the performance of your vehic le’s catalytic converter
and may produce a sulfur exhaust odor or smell.
SUBARU recommends that you try a different brand of
unleaded gasoline having lower sulfur to determine if
the problem is fuel related before returning your vehi-
cle to an authorized dealer for service. Gasoline for cleaner air
Your use of gasoline with detergent additives will help
prevent deposits from forming in your engine and fuel
system. This helps keep your engine in tune and your

8-1
8
Driving tips
New vehicle break-in driving – the first
1,000 miles (1,600 km) ................................. 8-2
Fuel economy hints ..................................... 8-2
Engine exhaust gas (Carbon monoxide) .. 8-3
Catalytic converter ...................................... 8-4
Periodic inspections ................................... 8-5
Driving in foreign countries ........................ 8-5
Driving tips for AWD vehicles .................... 8-6
Off road driving ........................................... 8-7
Winter driving .............................................. 8-9 Operation during cold weather ...................... 8-9
Driving on snowy and icy roads .................... 8-11
Corrosion protection ...................................... 8-12
Snow tires ........................................................ 8-12
Tire chains ....................................................... 8-13
Rocking the vehicle ........................................ 8-13
Loading your vehicle .................................. 8-14 Vehicle capacity weight .................................. 8-15
GVWR and GAWR (Gross Vehicle Weight
Rating and Gross Axle Weight Rating) ......... 8-16
Roof rail and crossbar (if equipped) ............. 8-17
Trailer hitch (if equipped) ........................... 8-22 Connecting a trailer ........................................ 8-22
When you do not tow a trailer ........................ 8-24
Trailer towing ............................................... 8-25 Warranties and maintenance ......................... 8-25
Maximum load limits ....................................... 8-25
Trailer hitches ................................................. 8-30
Connecting a trailer ........................................ 8-31 Trailer towing tips ........................................... 8-32

8-4
Driving tips
Catalytic converter
The catalytic converter is installed in the exhaust sys-
tem. It serves as catalyst to reduce HC, CO and NOx
in exhaust gases, thus providing cleaner exhaust.
To avoid damage to the catalytic converter:
Use only unleaded fuel. Even a small amount of
leaded fuel will damage the catalytic converter. Never start the engine by pushing or pulling the ve-
hicle. Avoid racing the engine.
Never turn off the ignition switch while the vehicle is
moving.
Keep your engine tuned-up. If you feel the engine
running rough (misfiring, backfiring or incomplete
combustion), have your vehicle checked and repaired
by an authorized SUBARU dealer. Do not apply undercoating or rust prevention treat-
ment to the heat shield of catalytic converter and the
exhaust system.
Avoidfirehazards.Donotdriveorparkthe
vehicle anywhere near flammable materials
(e.g. grass, paper, rags or leaves), because the
catalytic converter operates at very high tem-
peratures. Keep everyone and flammable materials
away from the exhaust pipe while the engine is
running. The exhaust gas is very hot.
HS8002BA