Who is correct regarding the reuse of an exhaust manifold gasket?

In the context of exhaust manifold gaskets, Technician B is correct in stating that the gasket should not be reused. Exhaust manifold gaskets are subject to high temperatures and pressure, leading to material degradation over time. Reusing an old gasket can compromise the seal, potentially causing exhaust leaks, which can impact engine performance, emissions, and overall vehicle operation.

Continual exposure to the extreme environment of the exhaust manifold can cause the gasket to lose its shape and sealing characteristics, making it less effective in its role. Therefore, it is emphasized in automotive service practices that whenever exhaust components are serviced or replaced, a new gasket should be installed to ensure proper sealing and performance.

Technician A may have a different viewpoint on the reusability of gaskets, which is not in line with best practices for exhaust systems. This reinforces the accepted standard that for reliable and safe vehicle operation, new gaskets should be utilized to avoid potential issues associated with reusing old components.