There's a reason why many car owners blanch when they are told that it is time to replace their GMC head gasket. The job requires very close attention to detail, and takes a lot of time to ensure a quality job. On the pro side, however, you will save yourself a tremendous amount in repair bills by replacing the GMC head gasket yourself when it fails. You will save even more money by ordering a quality GMC head gaskets from our site. By ordering from brand-name manufacturers, you can be confident that your new gaskets will be able to stand up to the heat, friction and usage that they must endure. The gasket must protect the engine and the cooling system from leaking fluids and gases into the wrong compartments. When a head gasket fails, you will start to see oil in the coolant fluid, and coolant fluid in the oil. The exhaust pipe will emit a tell-tale plume of white smoke. That's actually not smoke, but steam that is the byproduct of the coolant leaking into the cylinders and heating up. Head gaskets are designed to last for the life of your engine, but lack of maintenance and improper installation can shorten the lifespan. So follow the instructions in your GMC owner's manual to use the proper coolant in the right mixture, and change your fuel and air filters regularly.