Recommended Grade And Viscosity Under Severe Driving Conditions; Cooling System - Subaru 2007 B9 Tribeca Owner's Manual

11-10
Maintenance and service
-30 -20 -10 0 10 20 30 40
-30 -20 -10 0 10 20 30 40
-20 0 20 40 60
-20 0 20 40 60
10W-30, 10W-40
5W-30*
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.
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
80 100
80 100
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.:
B00543
B00016
30, 40, 10W-50, 20W-40, 20W-50

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 wa-
ter) and 50% phosphate or non-
amine type coolant. Use of im-
proper coolants may result in cor-
rosion 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.