You’re probably familiar with aftermarket car parts used for repairs. You may also know the origin of OEM, or factory, parts. But what is the difference between these two options that makes one better than the other?

The simplest answer is that Original Equipment Manufacturer (OEM) parts are made by a vehicle manufacturer for use on their products. In many cases, OEM parts are a required component of repairs for vehicles that are still under warranty. OEM parts typically are constructed with higher quality materials and are more durable.

Aftermarket parts, which are made by companies other than the original vehicle manufacturer, are sometimes cheaper but their quality can be in question due to variable production standards that are not regulated by the vehicle manufacturer.

Sometimes small repairs, like replacing light bulbs and other relatively non-essential parts, can be completed safely with aftermarket products; but replacement parts for critical vehicle components should come from the factory.

From air filters and carburetors all the way to transmissions, factory parts are available online and at authorized local vehicle dealers. If a repair is being performed at an authorized dealership, rest assured OEM parts are most likely being used. However, if you have an independent mechanic, you may need to confirm the use of OEM parts or risk the chance that lesser quality aftermarket parts are installed.