Engine Coolant - Propylene Glycol Acceptable for Use

BULLETIN NUMBER
SB96-14-L002

ISSUE DATE

JANUARY 1996

GROUP
MISCELLANEOUS

PROPYLENE GLYCOL - BASED ENGINE COOLANT
(Supersedes SB94-14-005)

AFFECTED VEHICLES

All Isuzu passenger, sport utility, and light truck models.

SERVICE INFORMATION

Isuzu has determined that propylene glycol-based engine coolants, such as Safe Brands' Sierra engine coolant, will perform adequately under most vehicle operating conditions. As a result, propylene glycol-based engine coolants may be used in Isuzu vehicles.

A few important points to remember regarding propylene glycol-based engine coolants:

^ Freeze/boil point levels for propylene glycol are different than for ethylene glycol.

^ To accurately determine the freeze/boil protection level, it is imperative that the coolants not be mixed.

^ Prior to adding propylene glycol engine coolant to the cooling system, all ethylene glycol coolant must be removed.

^ When changing the coolant to propylene glycol, be certain to thoroughly flush the heater core and block as well as the radiator.