Subaru 2009 IMPREZA Service Manual page 348

COOLING
B: ADJUSTMENT
1. PROCEDURE TO ADJUST THE SUBARU SUPER COOLANT CONCENTRATION
CAUTION:
Use the SUBARU Super Coolant with a 50 — 60% concentration in order to obtain maximum anti-
freeze and anti-rust performance.
To adjust the concentration of SUBARU Super Coolant according to temperature, find the proper SUBARU
Super Coolant concentration in the table, and add dilution water to the SUBARU Super Coolant (concentrat-
ed type) until it reaches the proper dilution.
Relationship of SUBARU Super Coolant concentration and freezing temperature
SUBARU Super Coolant concentration
Freezing temperature
Engine coolant and diluting water:
Refer to "SPECIFICATION" for recommended engine coolant and diluting water. <Ref. to
CO(H4SO)-2, SPECIFICATION, General Description.>
Engine Coolant
50%
–36°C (–33°F)
CO(H4SO)-14
55%
–41°C (–42°F) –50°C (–58°F)
60%