Engine Shop

“What’s the difference between remanufactured engines and rebuilt or used engines?”

A question we receive frequently is, “What’s the difference between remanufactured engines and rebuilt or used engines?” Many people confuse rebuilt products with remanufactured (reman) products, and some may even assume that a used product will be an adequate replacement alternative to their failed engine.

At Warren Engines, the abundance of experience paired with research and development enables us to refurbish components that exceed the quality and tolerances of the OEM (Original Equipment Manufacturer). Completely remanufactured… for a lot less than you might think.

But, whatever term you use for that component you’re having installed in your car, truck, or SUV, you should make sure that you’re getting exactly what you pay for. We won’t release an engine back into its environment without the assurance of 100% customer satisfaction, so here’s how we differentiate used, rebuilt and remanufactured:


Used components are pulled directly from a vehicle – typically a junkyard vehicle – and generally not even so much as surface cleaned. There are no provisions for disassembly, internal cleaning or inspection with a used component. Used or junkyard components may have high mileage and a poor maintenance history – a failure waiting to happen. Many used or junkyard components come from a vehicle that was involved in an accident and may have unseen damage.


To rebuild is to recondition by cleaning, inspecting and replacing severely worn or broken parts. Serviceable parts are reused within the manufacturer’s acceptable wear limits. The quality of rebuilt components varies widely and many come with only a limited warranty.


To remanufacture is to make as close to new as possible. Most wearable parts are automatically replaced. All core material is closely inspected and checked against original equipment specifications for correct dimensional size, wear, and tolerance. Replacement parts are 100% new, meaning parts are made in the same production processes as original equipment. Testing is performed to manufacturer specifications and original production standards.

Choose for yourself, but know that Warren Engines will only provide completely remanufactured engines with a nationwide warranty. You can drive away from your technician’s shop with confidence if you have a Warren Engines reman component.

  • ENGINE SHOP (Full Service)
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