How can we help you?

All parts sold at BuyParts.Online are brand new unless otherwise clearly stated in the product description.

We source from trusted OEM and aftermarket manufacturers. Specific brand information is listed on the product page when available.

Most parts include a manufacturer warranty (typically 1 year).

BuyParts.Online does not provide additional warranties and does not cover:

• Labor costs
• Downtime
• Towing
• Progressive or secondary damage

For warranty claims, contact support with:

• Order number
• VIN
• Starting mileage
• Breakdown mileage
• Description of issue
• Clear photos

Even though we have millions of part numbers in our online store, we don't have them all. Feel free to start a chat to inquire about it. We have access to multiple vendors and may be able to help.

You are responsible for verifying compatibility before purchasing.

If you’re unsure, contact us before ordering with:

• VIN number
• Year, make, and model
• Engine size (if applicable)

Our team will help confirm fitment.

If the part is unused, uninstalled, and in original packaging, you may request a return within 30 days of purchase. Return shipping costs are the customer’s responsibility.

We assist with compatibility verification, but final responsibility lies with the customer to confirm fitment before installation.

No. We do not reimburse labor, towing, diagnostic fees, or downtime.

Installed parts are not eligible for return unless approved under warranty terms.

Professional installation is strongly recommended.

OEM means the part was made to the original manufacturer's specification, same material, same tolerances, same fit as what came on the truck from the factory.

Aftermarket means a third-party has made it to work as a direct replacement. For most applications, quality aftermarket parts perform just as well and cost less. 

We carry both, and we label them clearly, so you know what you're getting

Yes, in the vast majority of cases. Superseded part numbers happen when a manufacturer updates the packaging, specification, or sourcing for a component, not necessarily the part itself. The new number is the current recommended replacement and is backward compatible with the original application. 

On BuyParts.Online, if we list a part as superseded, the replacement has been confirmed compatible unless we say otherwise.

For most standard replacement applications, yes, as long as the aftermarket part is built to the right spec. The difference isn't OEM vs aftermarket; it's quality of manufacturing and accuracy of the cross-reference. We only carry premium aftermarkets from established suppliers, not generic catalog parts.

If you're in a fleet warranty situation or have a standardization requirement, OEM is the safer call; we have that too.

Part numbers exist because parts that look the same can have different specs, thread pitch, port size, pressure rating, internal tolerances. Two brake chambers or two valves can be ph ysically indistinguishable and still not be interchangeable.

Always use the correct OEM part number or a verified crossreference, not a visual match. Getting this wrong costs more than the part.

Orders are typically processed within 1–3 business days. (change to reach out to email)

Processing times may vary depending on supplier availability.

Delivery times depend on the shipping method selected at checkout and the destination of the order.

Estimated transit times:

• U.S. Orders (Standard Shipping): 3–7 business days
• U.S. Orders (Expedited Shipping): 1–3 business days
• International Orders: 3–14 business days (varies by country and shipping method)

Delivery times are estimates only and may vary due to carrier delays, customs processing (for international orders), or other factors outside of our control.

Orders placed after daily cutoff times may ship the next business day. We cannot guarantee same-day shipping.

Yes. Once your order ships, you’ll receive tracking details via email.

Yes. International shipping times and fees vary by location.

Customs duties and import taxes (if applicable) are the buyer’s responsibility.

Yes. Many of the parts we carry are large, heavy, or freight-class items, axles, engine assemblies, transmissions, suspension components.

If you're ordering a large component, make sure your delivery location has the equipment or dock access to receive it.

We accept returns within 30 days of purchase.

To qualify:

• Item must be unused and uninstalled
• Original packaging must be intact
• Proof of purchase required

1. Log into your account
2. Go to “Your Orders”
3. Select the item
4. Request a return

Or email: support@buyparts.online

Do not send items back without authorization.

Customers are responsible for return shipping unless the item was incorrect or defective.

Once your return is received and inspected:

• Approved refunds are issued within 3–7 business days
• Refunds go to your original payment method
• Bank processing may take additional business days

Returns that are:

• Used
• Installed
• Damaged
• Missing packaging

May be denied and returned to you at your expense.

Orders can only be canceled before they are processed or shipped.

Contact us immediately if you need to cancel.

If we sent the wrong item, contact us within 7 days of delivery. We will provide return instructions and cover return shipping.

Contact us within 48 hours of delivery with:

• Photos of the item
• Photos of the packaging
• Your order number

We will assist you promptly.

Try the cross-reference number first; the same part often lives under multiple OEM and aftermarket numbers. If that doesn't work, search by description or category. It's also worth checking if the part has been superseded; the number you have may have been replaced by a newer one.

If you're still stuck, reach out with your part number, VIN, and what system it belongs to, and we'll track it down.

No. We do not sell customer data.

We accept major credit and debit cards, along with other secure payment options available at checkout.

Yes. BuyParts.Online has been operating since 2019 and has supplied heavy duty truck parts to fleet managers, owner-operators, repair shops, and commercial trucking businesses. 

We source from established OEM and premium aftermarket manufacturers, provide transparent part and fitment information, and offer a credit line program for commercial buyers. 

Our support team is reachable by phone at (888) 497-4887, by email, or through live chat.

Email: support@buyparts.online

Please include your order number for faster assistance.

Most auto parts platforms are built for passenger vehicles and treat commercial trucks as a secondary category. BuyParts.Online is built specifically for the heavy-duty market.

That means deeper catalog coverage for commercial applications, fitment data that accounts for engine family, axle configuration, and build spec. not just year, make, and model, and a support team that understands how trucks are actually spec'd and serviced. We also offer fleet pricing, credit lines, and bulk ordering tools that general retailers don't.

And while heavy-duty trucking is our flagship, our parts intelligence platform is built to grow, we are expanding into automotive, agricultural, construction, and marine parts to serve the broader industrial market.

BuyParts.Online has been operating since 2019.

 Over the past five years, we've built our catalog, data infrastructure, and support operations around the specific needs of commercial trucking, fleet managers, owner-operators, repair shops, and diesel technicians who need the right part quickly and accurately.

We're not a general marketplace that added truck parts. This is what we do.

Orders may be canceled due to:

• Payment verification issues
• Inventory availability
• Billing discrepancies

If your order was canceled, you will be notified via email.

Changes may be possible before processing begins. Contact us immediately if adjustments are needed.

Yes. The platform is set up for commercial buyers, not one-off retail orders. Fleet managers and repair shops can apply for a credit line and access wholesale pricing.

If you're ordering in volume or need account terms, get in touch or go through the credit line application, and we'll work out what makes sense for your operation.

Yes. You can submit multiple part numbers at once, useful for fleet maintenance orders or shop restocking. 

You can access it directly from the site. If you need help structuring a large order or want to discuss volume pricing, contact our support team directly.

Commercial trucks built in the same year can have completely different specs depending on the engine, transmission, axle configuration, and cab type. A 2019 Freightliner Cascadia with a DD13 needs different parts than one with a DD15, even for the same system. Year/make/model is a starting point, not the whole picture.

If you're ordering a part where fitment is critical, use your VIN or engine serial number to confirm before you buy.

The VIN encodes the exact build spec of the truck, engine family, transmission type, axle ratio, and build date. For parts where those details affect fitment (brake components, suspension, drivetrain), VIN verification is the only reliable way to confirm you're getting the right part.

It's not extra friction; it's how you avoid ordering something that looks right but isn't.

In order: the OEM part number from the truck's service manual or the part you're replacing, the full 17-digit VIN, the engine serial number if it's an engine related component, and the specific system (brakes, suspension, drivetrain,etc.). If you have a cross-reference number from a previous supplier, that works too. 

The more of these you have, the faster and more accurate the match.

Both. Many components, filters, belts, lighting, electrical connectors, and other maintenance items are available as all-makes parts that fit multiple truck brands. Where a part is brand or model-specific, we list it that way. 

You can search by brand, by system, or by part number, regardless of brand origin.