Should a sealer be used on the head gasket?

Using a sealer on a head gasket is generally not recommended because modern head gaskets are designed to seal effectively without additional substances. The design and material of these gaskets, including multi-layer steel (MLS) or composite types, provide the necessary sealing capabilities under normal operating conditions. When a sealer is applied, it can interfere with the gasket’s ability to create a proper seal, potentially leading to leaks, overheating, or engine failure.

Additionally, the improper use of sealants can lead to complications during future maintenance, as they may make it difficult to remove the gasket or clean the mating surfaces properly. In many cases, if there’s a need to use a sealer, it may indicate that the original gasket is damaged or that the surfaces are not prepared correctly. It is essential to address the root cause of the sealing issue rather than relying on a sealer as a quick fix.