Impulse L4-2254cc 2.3L SOHC (1988)
Coolant: Technical Service Bulletins
Coolant - Propylene Glycol Not Approved by Isuzu
BULLETIN NUMBER
SB94-14-005
ISSUE DATE
DECEMBER 1994
GROUP
MISCELLANEOUS
PROPYLENE GLYCOL-BASED ENGINE COOLANT WARNING
AFFECTED VEHICLES
All Isuzu passenger and light duty models.
SERVICE INFORMATION
Some new propylene glycol-based engine coolants, such as Safe Brands' Sierra engine coolant, have recently been marketed in the automotive service
industry as "environmentally safe" alternatives to conventional ethylene glycol-based engine coolants.
Propylene glycol-based engine coolants are not approved by Isuzu for use in Isuzu vehicles.
Propylene glycol-based engine coolants do not meet Isuzu engine coolant specifications. Use of propylene glycol-based engine coolants in Isuzu vehicles
can cause the following:
^
Reduced heater and defroster performance.
^
Decreased boil protection and freeze protection.
^
Decreased cylinder head heat transfer.
^
Corrosion damage to cooling system metals (if mixed with ethylene glycol-based engine coolant).
