OEM vs Aftermarket Parts: Your Rights When Insurers Push Cheap Alternatives

OEM vs Aftermarket Parts: Fighting for Proper Parts in Insurance Repairs

The Parts Battle

One of the most common cost-cutting tactics by insurance companies is requiring aftermarket (non-OEM) parts instead of genuine manufacturer parts. While aftermarket parts can be acceptable for some applications, they are frequently inferior — and most manufacturers explicitly prohibit them for structural and safety-related repairs.

Types of Replacement Parts

OEM (Original Equipment Manufacturer)

• Made by or for the vehicle manufacturer
• Meets exact specifications for fit, finish, and crash performance
• Maintains manufacturer warranty
• Consistent quality and reliability
• Typically 20-40% more expensive than aftermarket

Aftermarket (Non-OEM)

• Made by third-party manufacturers
• May not meet OEM specifications for fit or performance
• Does NOT maintain manufacturer warranty on repaired components
• Quality varies dramatically between manufacturers
• Sometimes requires modification to fit properly

Recycled/Salvage (Used OEM)

• Genuine OEM parts removed from salvaged vehicles
• Original manufacturer quality but may have wear or hidden damage
• Quality depends on the salvage source and inspection
• Can be a reasonable middle ground for non-structural parts

Reconditioned/Remanufactured

• Used parts that have been restored to functional condition
• Quality depends on the reconditioning process
• May be acceptable for some mechanical components

OEM Position Statements on Parts

Most major manufacturers have published position statements stating their requirements:

Tesla

Tesla requires OEM parts for all repairs. Tesla does not authorize aftermarket or recycled parts for any application. Non-OEM parts void Tesla's warranty on repaired components.

BMW

BMW requires OEM parts for structural and safety-related repairs. BMW's corrosion warranty is voided if aftermarket structural parts are used.

Mercedes-Benz

Mercedes-Benz requires OEM parts for all certified collision repairs. Their position statement specifically prohibits aftermarket structural parts.

Honda

Honda recommends OEM parts for all collision repairs and notes that aftermarket parts may not provide equivalent crash performance.

Toyota

Toyota's position statement recommends OEM parts for structural and safety-related components, noting that aftermarket parts have not been tested for crash performance.

State Laws on Parts Usage

Many states have laws governing replacement parts in insurance repairs:

Disclosure Requirements

Most states require insurers to:

• Disclose when non-OEM parts are specified on an estimate
• Notify the vehicle owner that aftermarket parts will be used
• List the specific aftermarket parts by name and manufacturer

Quality Requirements

Some states require that aftermarket parts be:

• Of like kind and quality (LKQ) to OEM parts
• Certified by an independent testing organization (CAPA or NSF)
• Warrantied by the insurer for fit and performance

Vehicle Age Restrictions

Some states prohibit aftermarket parts on vehicles under a certain age (typically 2-3 years old).

How to Fight for OEM Parts

1. Cite the OEM Position Statement

Attach the manufacturer's position statement to your estimate. When the manufacturer explicitly requires OEM parts, the insurer's case for aftermarket becomes much weaker.

2. Document Fit Issues

If aftermarket parts don't fit properly:

• Photograph the fit issue (gaps, misalignment, interference)
• Document the time spent trying to make the part fit
• Request authorization for OEM parts based on fit failure
• Charge for the wasted labor attempting to fit the aftermarket part

3. Reference Crash Testing

OEM parts are designed and tested to perform in a crash. Aftermarket structural parts have not been crash-tested. In a subsequent collision, an aftermarket part may fail differently than the OEM part, potentially increasing injury severity.

4. Warranty Impact

Notify the vehicle owner in writing that aftermarket parts may void the manufacturer's warranty on repaired components. Many owners will then request OEM parts from their insurer — and most policies give the insured the right to choose.

5. CAPA Certification

If aftermarket parts are used, insist on CAPA-certified parts at minimum. CAPA (Certified Automotive Parts Association) tests aftermarket parts for fit, finish, and corrosion resistance. CAPA-certified parts are generally acceptable for non-structural applications.

The Cost Argument

Insurers argue that aftermarket parts save money. But consider the hidden costs:

• Fitting labor: Aftermarket parts often require modification — 0.5-2 hours additional labor
• Returns: Higher return rate than OEM parts due to fit and quality issues
• Comebacks: Aftermarket parts may fail prematurely, requiring a second repair
• Warranty claims: If an aftermarket part fails, who pays — the shop, the insurer, or the vehicle owner?

When you add up these hidden costs, the savings from aftermarket parts often evaporate — and the vehicle owner is left with a repair that may not perform as designed in a future collision.