GM Service Manual Online
For 1990-2009 cars only

Info - Correct RTV Usage on 4.2L Engine

Subject:Correct RTV for Usage on 4.2L Engine

Models:2002 Chevrolet and GMC S/T Utility Models (Trailblazer, Envoy)
2002 Oldsmobile Bravada
with 4.2L Engine (VIN S - RPO LL8)



It is very important that the correct RTV be used on the 4.2L engine. The correct RTV to be used when re-sealing the front cover, rear cover or engine oil pan is shown below.

Using the wrong RTV may lead to leaks. RTV should be applied using instructions provided in the applicable Service Information.

Part Number

12378521 (U.S.)

88901148 (Canada)

Parts are currently available from GMSPO.