C 1500 Truck 2WD V8-454 7.4L (1990)
Coolant: Technical Service Bulletins
Coolant - Specification/Usage
Number:
91-62-6B
Section:
6B
Date:
August 1990
Corp. Bulletin No.: 066202
Subject:
COOLANT USAGE
Model and Year:
ALL 1988-91 PASSENGER CARS AND TRUCKS
TO:
ALL CHEVROLET DEALERS
THIS INFORMATION SUPERSEDES INFORMATION PROVIDED BY GMSPO IN PARTS AND ACCESSORIES BULLETINS IB NO. 90-55
AND 90-60 AND INFORMATION PROVIDED IN VARIOUS TRUCK SERVICE AND OWNERS MANUALS AND SHOULD BE USED TO
DETERMINE CORRECT COOLANT USAGE IN LIGHT AND MEDIUM DUTY TRUCK APPLICATIONS.
GM coolant specification 6038-M or 1899-M (P/N 1052103) is for use in all light duty trucks with gasoline or diesel engines. This coolant features a low
silicate formulation and is intended only for use in engines that have cylinder heads and cylinder blocks made of cast iron.
GM coolant specification 1825-M or 6043-M (P/N 1052753) which until recently has been the recommended coolant for light duty trucks has been
superseded by GM coolant 6038-M or 1899-M (P/N 1052103) in cast iron truck engines. GM coolant specification 1825-M has a higher silicate
formulation which is recommended for all passenger car engines with cylinder heads or cylinder blocks made of aluminum.