Recommended Grade And Viscosity Under Severe Driving Conditions; Synthetic Oil; Cooling System - Subaru 2007 Forester Owner's Manual

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5W-30*
10W-30, 10W-40
SAE viscosity number and applicable
temperature
*: 5W-30 is recommended.
Engine oil viscosity (thickness) affects fuel
economy. Oils of lower viscosity provide
better fuel economy. However, in hot
weather, oil of higher viscosity is required
to properly lubricate the engine.
Use only engine oil with the recom-
mended grade and viscosity.
Recommended grade and
viscosity under severe driv-
ing conditions
If the vehicle is used in desert areas, in ar-
eas with very high temperatures, or used
for heavy-duty applications such as tow-
ing a trailer, use of oil with the following
grade and viscosities is recommended.
API classification SM (or SL):
SAE viscosity No.:
30, 40, 10W-50, 20W-40, 20W-50

Synthetic oil

You can use synthetic engine oil that
B00549
meets the same requirements given for
conventional engine oil. When using syn-
thetic oil, you must use oil of the same
classification, viscosity and grade shown
in this Owner's Manual, and must follow
the oil and filter changing intervals shown
in the maintenance schedule.
11-11
Maintenance and service

Cooling system

Never attempt to remove the radia-
tor cap until the engine has been
shut off and has cooled down com-
pletely. Since the coolant is under
pressure, you may suffer serious
burns from a spray of boiling hot
coolant when the cap is removed.
The cooling system has been filled
at the factory with a high quality,
corrosion-inhibiting, year-around
coolant which provides protection
against freezing down to –33°F
(–36°C). For adding, use genuine
SUBARU coolant or an equivalent: a
mixture of 50% soft water (or clear
and drinkable water) and 50% phos-
phate or non-amine type coolant.
Use of improper coolants may result
in corrosion in the cooling system. It
is important to maintain protection
against freezing and corrosion,
even if freezing temperatures are
not expected. Never mix different
kinds of coolant.
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