Why does your engine shake after an oil change?

An engine may shake after an oil change due to several reasons, including incorrect oil level or type, air trapped in the oil passages, or loose components that were disturbed during the service. If the oil filter was not properly installed or replaced, it could also lead to issues. Additionally, if the engine mounts are worn or damaged, vibrations may become more noticeable after an oil change. It's important to check for any leaks and ensure all components are secured properly.