Best Online Auto Parts Stores

For most repairs, RockAuto and Amazon Garage are the volume answers, with RockAuto winning on price and Amazon winning on speed. Beyond those two, the right site depends on the car: FCP Euro for VW, BMW, Mercedes; Summit Racing for performance; AutoZone or Advance Auto for pickup-today urgency.

Below: where each site actually fits, what they’re bad at, and how to think about the tradeoffs.

Quick comparison

Site	Best for	Speed	Return policy	Customer service
RockAuto	Cheap OEM and aftermarket	3 to 7 days	30 day, you pay return shipping	Email/web form only
Amazon Garage	Speed, mainstream parts	1 to 2 days with Prime	Varies by seller	Excellent for Amazon-sold
AutoZone	Pickup today, common parts	Same day in-store	90 day, in-store easy	Phone, in-store
Advance Auto Parts	Same-day pickup, app-based discounts	Same day	45 day	Phone, in-store
Summit Racing	Performance, racing parts	1 to 3 days	90 day	Phone, chat, email
FCP Euro	VW, BMW, Mercedes, Audi, Volvo	2 to 4 days	Lifetime warranty replacement	Phone, chat
Buy Auto Parts	Auto body and OE replacement	2 to 5 days	60 day	Phone, live chat
1A Auto	Mainstream replacement parts	Same-day ship, 2 to 5 day delivery	60 day, unused only	Phone, email
CarParts.com	Wide catalog, body parts	2 to 5 days	90 day	Phone, chat
eBay	Rare or vintage parts	Varies by seller	Per seller	Seller-dependent

RockAuto

The DIY mechanic’s default. Catalog is huge, prices are typically 20 to 50% below brick-and-mortar, and OEM and aftermarket sit side by side with brand and price visible.

The tradeoffs: shipping is expensive on small orders (consolidate, or ship at the threshold), there’s no phone support, the website still looks like 2003, and returns are at your cost. Mistakes (wrong part for your VIN) become your problem.

Most-used trick: shop the catalog, note the part numbers, then check Summit, Amazon, or local before pulling the trigger. Sometimes RockAuto wins, sometimes someone else does.

Amazon Garage

Add your vehicles to Amazon Garage, search for parts, the site filters by fit. Two-day or sometimes same-day delivery on Prime, no-questions returns on Amazon-fulfilled items.

The trap: third-party sellers using Amazon as a marketplace. Counterfeit parts, “fits your vehicle” claims that don’t, and return policies that vary wildly. Stick to brand-name parts sold and shipped by Amazon, or by the manufacturer’s own Amazon store.

AutoZone

The pickup-today option. The website lets you check local store inventory, reserve, pay online, and pick up in the parking lot. Same for Advance Auto and O’Reilly.

Prices are higher than RockAuto but you have the part in your hand in 30 minutes. Worth it for brake jobs, oil changes, anything you can’t drive the car to wait three days for.

AutoZone’s loyalty program (AutoZone Rewards) gives $20 back after five qualifying purchases. Free curbside pickup. Free tool rental for many specialty jobs (you pay a deposit, return the tool, get the deposit back).

Advance Auto Parts

Same playbook as AutoZone. App often has aggressive discount codes (25% off coupons run constantly). Speed Perks loyalty program. Same-day pickup at most locations.

Between AutoZone and Advance, just pick whichever store is closer and check both for the part.

Summit Racing

For performance, racing, lift kits, headers, cams, fuel systems. Catalog is deep for street, strip, off-road, and classic. Customer service has actual humans on the phone who know cars.

For ordinary maintenance parts (brake pads, filters, sensors), Summit isn’t price-competitive with RockAuto. But for anything specialized, they’re usually who you call.

FCP Euro

European-car focused: VW, BMW, Mercedes, Audi, Volvo, Porsche, MINI. The differentiator is the lifetime warranty: any part you buy, if it ever fails, FCP replaces it for free. You just send back the failed part.

That math works heavily in your favor on wear items (brakes, suspension bushings, control arms) on cars that need repeat replacements over a decade. The prices aren’t always the lowest, but the warranty makes a big chunk of long-term ownership cheaper.

Buy Auto Parts

Auto body and OE replacement focus. Bumper covers, headlights, mirrors, tail lights, fenders, hoods. 60 day return policy, free shipping over $99, real phone support.

For body work after a collision, often a better answer than the local body shop’s marked-up parts.

1A Auto

Known for the YouTube install videos. Solid mainstream parts catalog, free shipping, same-day ship if you order before 2pm ET. 60-day return as long as parts are unused.

The video library is the actual reason to use them. Hard to overstate how much it helps to watch someone install the part on the same car before you do it.

CarParts.com

Volume online retailer with regional distribution hubs (faster shipping than RockAuto for many ZIP codes). Wide catalog including body parts. 90-day return policy.

Quality varies by part. OEM-equivalent on common items, generic on others. Read reviews before pulling the trigger on no-name brand parts.

eBay

The rare-parts answer. Discontinued OEM stuff, NOS (new old stock), used good-condition pulls from junkyards. For a 1998 Miata trim piece nobody else stocks, eBay is the answer.

Risk: seller quality varies. Stick to sellers with 500+ feedback and 99%+ positive. PayPal buyer protection covers most disputes.

How to actually shop

For a typical DIY repair:

Search RockAuto by VIN. Note the price.
Check the same part on Amazon Garage. If Prime is $5 to $10 more, take Amazon for the speed.
For European cars, check FCP Euro for the warranty math.
For performance or specialty stuff, Summit.
Need it today? AutoZone or Advance.

Skip the “20 best online auto parts stores” lists that just rank by name recognition. The right answer depends on the car, the part, and how fast you need it.

Returns matter more than price

A wrong part you can’t return well costs more than a slightly overpriced part you can. Sites with real phone support and clear return policies (FCP Euro, AutoZone, Summit, Buy Auto Parts) earn back the price difference over time.