Are a manufacturer's car parts always better than aftermarket auto parts?

This question is like asking, "Are original phone cases always better than third-party ones?"—not necessarily. The automotive parts market is complex and multifaceted; it depends on the specific part type and brand prestige. Here's the logic for judging:

I. The Truth About Original Equipment (OEM) Parts

■ Advantages:

Precision-Matching Parts: OEM parts, like engine sensors and transmission valve bodies, are 100% compatible with your car model—just plug and play.
Safety Core Components: OEM parts, such as airbags and seatbelt buckles, have undergone crash testing and certification. Don't skimp on these life-saving features.
Electronic Modules: OEM programs have far superior compatibility compared to aftermarket parts.

■ Fatal Disadvantages:

Price Killer: A 4S dealership might charge 3000 for an original headlight replacement, while a "genuine" part of the same model with the logo removed costs only 800.
Excessive Packaging: A plastic box with a car logo printed on it doubles the price, even though it's produced on the same production line as other well-known brands.

II. Opportunities for Aftermarket Parts

■ High-Value Area:

Wear Parts: Wiper Blades, Cabin Air Filters – Mann, Mahle, and other reputable brands offer quality comparable to original equipment manufacturer (OEM) parts at half the price.
Exterior Parts: Bumpers, Rearview Mirror Housings – Branded parts (such as TYC) offer sufficient precision; minor scratches make replacements affordable.
Consumable Parts: Brake Discs and Pads – Bosch and Ferodo are reliable and durable.

■ High-Risk Area:

Unbranded/Unpackaged Parts: Sold as "OEM replacements" at street stalls, they develop abnormal noises after only three months of use.
Counterfeit Logo Parts: Fake spark plugs with a Toyota logo, resulting in erratic idling.

III. Expert Parts Selection Tips

■ Select Parts by Location → Safety Parts (Airbags/Brakes) → Choose Original Equipment Manufacturers
→ Functional Parts (Shock Absorbers/Bearings) → Choose Top-Tier Brands (KYB/SKF)
→ Trim Parts (Trimming Strips/Step Plugs) → Choose Reputable Aftermarket Manufacturers
■ Avoid Scams by Checking Channels → Check Part Numbers for Original Parts (Verifiable on Official Website)
→ Scan Anti-Counterfeiting Codes for Branded Parts (Verify Authenticity via WeChat)
→ Reject "Used Parts" Sold as New (Wearing Signs of Wear)

IV. Classic Comparison Examples