Models affected: 2008 and prior GM passenger cars and trucks (including Saturn); 2003-’08 Hummer H2; 2006-’08 Hummer H3; and 2005-’08 Saab 9-7X with gasoline or diesel engines

In 2005, General Motors consolidated the use of all liquid gaskets/engine sealants. At that time, two sealants replaced all previous sealants referred to in service information and/or the service manual.

In 2007, GM consolidated to one engine sealant already available in a 150 g cartridge and now in a 75 g aluminum tube. As a result, P/N 12346141, 54 g tube, has been deleted from service.

One of these, engine sealant P/N 12378521 (U.S.) and P/N 88901148 (Canada), was released in a cartridge to be used in a conventional caulking gun. The cartridge and conventional caulking gun proved to be too large and cumbersome in certain instances when used in on-vehicle service.

To address this concern, GM Powertrain Engineering released the engine sealant in a 0.075 kg (75 gram) squeeze tube (packaged six to the carton, with nozzles) along with a new essential service tool, Sealant Dispenser GE-48326.

Sealant Guidelines
The GM Powertrain engineering specification for applying this sealant is an even bead, 3 mm (0.118”) in diameter. Due...