Auto mechanic tightening an oil drain plug

Why New Cars Have Disposable Oil Drain Plugs Instead of Reusable Ones

A small but telling change has taken place under the hoods of modern vehicles: reusable metal oil drain plugs are being replaced by single-use plastic ones. Once a durable, serviceable part of the car’s engine system, the oil drain plug is now often designed to be discarded and replaced during every oil change.