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OEM

Car culture term

OEM
Photo: Original: DennisK Translated text: Kaasterly / Wikimedia Commons · CC BY 3.0

What is OEM?

Original Equipment Manufacturer. Refers to factory parts made by the same manufacturer that supplied the original vehicle. Counterpart to aftermarket.

OEM stands for Original Equipment Manufacturer. The term refers to factory parts produced by the same manufacturer (or supplier under contract) that supplied the original vehicle. OEM parts are the same parts the vehicle came with from the factory. The counterpart is aftermarket, which refers to parts produced by independent manufacturers.

OEM parts have specific advantages: they are designed to factory specifications, they fit perfectly, they are warrantied by the manufacturer, and they are supported by dealer service networks. The disadvantages are higher cost (often 50-200% more than aftermarket equivalents) and limited choice (only one design typically available). Aftermarket parts may offer different price points, different design philosophies, or performance enhancements not available in OEM.

OEM-plus is a related term meaning "OEM parts from higher trims or related models." For example, fitting Civic Type R parts to a base Civic LX is OEM-plus modification: all parts are factory Honda parts, but they are upgrades from the original specification. This is often preferred over pure aftermarket because the parts are factory-engineered and tested.

Related terms

OEM-plusJDMUSDM

Frequently asked questions

Are OEM parts better than aftermarket?
Different priorities. OEM parts are designed to factory specifications and fit guaranteed. Aftermarket parts may offer better performance, lower cost, or different design philosophy. For repairs maintaining original character, OEM is preferred. For performance modifications, aftermarket often offers better value. Quality varies significantly within both categories.
Why are OEM parts so expensive?
Multiple factors. Manufacturer warranty support. Dealer pricing markup. Complexity of supply chain. The brand premium. The same physical part from the same supplier (e.g., Bosch, Denso, Sachs) is often available cheaper through aftermarket distributors than through dealer parts counters. Buyers paying OEM prices are partly paying for the warranty and service network.
Is OEM the same as factory original?
Yes. OEM parts are factory-specification parts produced by the manufacturer or its suppliers. The terms "OEM," "factory," "factory original," and "OE" are often used interchangeably. All refer to the original equipment specification.
Can I install OEM parts myself?
Generally yes. OEM parts are designed for the original vehicle and typically fit without modification. Most OEM parts come with installation instructions or service manual references. Common OEM installations (brake pads, filters, belts) are within the capability of most home mechanics with basic tools.
Why do enthusiasts care about OEM specifically?
Preserving originality. Some enthusiasts (concours-quality restorers, JDM purists) prefer OEM parts to maintain the car authentic specification. The OEM-plus movement extends this by using OEM parts from related models for subtle upgrades. The preference is partly about authenticity and partly about engineering trust in factory-specification parts.

OEM on the blog

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