What should a technician verify when changing an oil filter with a spin-on filter?

When changing an oil filter with a spin-on type, it is crucial for a technician to verify that the oil filter gasket is properly installed. This step is vital because a faulty gasket can lead to oil leaks, which may cause a loss of oil pressure, engine damage, and potential catastrophic failure of the engine. Ensuring that the old gasket is removed and that the new filter's gasket is correctly seated prevents leaks and ensures a proper seal when the engine is in operation.

While confirming the correct size of the oil filter, the oil change interval, and the engine oil level are all important steps in the oil change process, none directly address the critical nature of the gasket's installation. An improperly installed gasket poses an immediate risk to engine performance and safety, making it the most critical aspect of this task.