About United Auto Parts
The free, independent platform that helps car owners find the right parts at the right price.
Our Mission
Buying auto parts shouldn’t require a mechanic’s license or hours of guesswork. Yet that’s exactly what millions of car owners face every time something needs replacing — confusing part numbers, unclear fitment, wildly different prices across retailers, and the eternal question: OEM or aftermarket?
UnitedAutoParts.com exists to solve that problem. We’re an independent comparison platform that helps you find the exact right part for your vehicle, understand what you’re buying, and get the best available price — all in one place, all for free.
We don’t sell parts. We don’t run a warehouse. We don’t have inventory to push. Our only job is to give you the clearest, most honest information so you can make the right decision for your car and your budget.
What We Do
Three things, and we aim to do them better than anyone else.
Expert Buying Guides
Vehicle-specific recommendations with side-by-side brand comparisons. We tell you exactly which part fits your car, which brand to trust, and where to get the best price.
Multi-Retailer Comparison
We compare pricing from Amazon, BuyAutoParts, AutoBarn, NAPA, AutoZone, and other trusted retailers so you never overpay. One search, multiple options.
DIY Repair Guides
Step-by-step instructions for every skill level. From changing oil to replacing brake pads, we give you the tools list, time estimate, and difficulty rating for every job.
How We Make Money (Full Transparency)
UnitedAutoParts.com is 100% free to use. We earn revenue through affiliate partnerships — when you click a link to a retailer on our site and make a purchase, we receive a small commission. You never pay anything extra. The price is the same whether you find the part through us or go directly to the retailer.
This model is what keeps us independent. We’re not owned by any parts manufacturer, retailer, or dealership chain. We don’t accept paid placements in our buying guides. When we recommend a part, it’s because our research says it’s the best option — not because someone paid us to say so.
Our affiliate partners include trusted retailers like Amazon, BuyAutoParts, AutoBarn, and NAPA, along with specialty brands through the CJ Affiliate and ShareASale networks. We clearly label affiliate links throughout the site, and our full affiliate disclosure is always available.
Our Editorial Standards
Every guide on UnitedAutoParts.com follows these principles.
Research-Driven
- ✓ OEM specs verified per vehicle
- ✓ Real-world user reviews analyzed
- ✓ Fitment data cross-referenced
- ✓ Pricing checked across retailers
Honest & Independent
- ✓ No paid placements in guides
- ✓ Affiliate links clearly labeled
- ✓ Both pros and cons for every part
- ✓ OEM and aftermarket fairly compared
United Auto Parts by the Numbers
What We Cover
Our guides span 14 major auto parts categories: brakes, engine, suspension and steering, electrical, exhaust, cooling and heating, transmission, filters, lighting, body and exterior, interior and accessories, tires and wheels, oil and fluids, and diagnostic tools. Within each category, we break down the specific parts you’re most likely to need — from brake pads and rotors to spark plugs, alternators, cabin air filters, and LED headlight bulbs.
We feature over 30 of the most trusted brands in the aftermarket and OEM parts industry, including Bosch, Denso, ACDelco, Moog, Wagner, Dorman, NGK, Monroe, Brembo, K&N, Michelin, Bridgestone, Mobil 1, Castrol, and more. Each brand page includes an honest assessment of quality, value, warranty coverage, and which vehicles they’re best suited for.
Our vehicle database covers every major make sold in the United States — from Toyota, Ford, Honda, and Chevrolet to BMW, Mercedes-Benz, Tesla, and Subaru. Each vehicle page shows you compatible parts, relevant buying guides, and applicable how-to repair instructions specific to your year, make, and model.
Who United Auto Parts Is For
DIY Mechanics
You do your own repairs and want to know which parts are the best value. Our buying guides and how-to instructions save you time and money.
Everyday Car Owners
You’re not a mechanic, but you want to understand what your car needs before visiting a shop. We help you avoid unnecessary upsells.
Smart Shoppers
You know that comparing prices saves money. We do the comparison work so you can find the same part for 20-40% less than the dealership.
Our Approach to OEM vs. Aftermarket Parts
One of the most common questions in auto repair is whether to buy OEM (Original Equipment Manufacturer) or aftermarket parts. You’ll find strong opinions on both sides — dealerships push OEM, budget shops push aftermarket. We take a different approach: it depends on the part, the vehicle, and your priorities.
For safety-critical components like brake pads, we generally lean toward established brands with strong testing records — whether that’s an OEM supplier like Akebono or a trusted aftermarket name like Wagner or Bosch. For commodity items like cabin air filters or wiper blades, aftermarket options often deliver identical performance at a fraction of the cost. For performance upgrades like cold air intakes or exhaust systems, aftermarket is typically the only option — and brands like K&N and Borla have earned their reputation through decades of real-world results.
Every buying guide on our site breaks down the OEM vs. aftermarket decision for that specific part and vehicle. We show you what the dealership charges, what the best aftermarket alternative costs, and whether the price difference is justified by quality differences. No blanket rules — just honest, part-by-part analysis.
Questions? We’re Here to Help
Have a question about a part, a guide, or how our site works? Get in touch — we read every message.
