Recommended Grade And Viscosity Under Severe Driving Conditions; Cooling System - Subaru Legacy Outback 2006 Owner's Manual

11-22
Maintenance and service
2.0-liter models and 3.0-liter models
-30 -20 -10 0 10 20 30 40
-20 0 20 40 60
5W-30*
10W-30, 10W-40
SAE viscosity No. and applicable tem-
perature
*: 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-
80 100
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
B00522

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 –36°C (–33°F). For adding, we
recommend that you use genuine
SUBARU coolant or an equiva-
lent: a mixture of 50% soft water
and 50% ethylene-glycol basis
coolant. Use of improper coolants
may result in corrosion in the
cooling system. It is important to
maintain protection against freez-
ing and corrosion, even if freezing
temperatures are not expected.
Never mix different kinds of cool-
ant.