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Shipping & Returns




We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.


When NEXT DAY/2 DAY/3 DAY delivery options are selected the clock does not start when the order is placed. It starts from the time the shipper picks up the items. UPS and US Mail Next Day or 2 Day means FULL business days, which does not include the day the items are picked up.

Example: An order is placed on Wednesday night, a UPS 2 Day package will not be picked up until 4:00PM Pacific Time on Thursday so the item will not arrive until Monday the following week. 

If you require a package to be delivered by Saturday then it would probably be best to call and place the order to avoid any delays and to give a live quote on the cost of shipping.



Returns Policy

You may return most new, unopened items within 30 days of delivery. A 20% restocking fee will be charged on any returned items that were not defective or were not shipped in error.  We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


Return Shipping Address

Petroworks Off Road Products

111 West Aviation Road

Fallbrook, CA 92028



Core Charge


When you purchase a rebuilt engine or other component from Petroworks, you are required to pay a deposit called a "core charge" until we have assessed the condition of your old parts (your "core"). We get a lot of questions regarding this policy (which is, by the way, an industry standard), and we want to take the opportunity to explain our core charge procedure thoroughly.


Our engines are sold on an "exchange basis." This means that when we send you a rebuilt Petroworks engine, we have to get your old engine in exchange. Your old engine is then stripped down and rebuilt from the ground up. Without this exchange process, the supply of engines to rebuild would quickly dry up. Thus, a rebuildable engine core is very valuable. This process literally recycles Samurai engines, which is incredibly important to those of you who need a replacement engine.


So, your engine has given up the ghost, and now you need a Petroworks replacement. There are numerous reasons why your original engine failed, and we have to address those issues before we begin the rebuilding process. If you've had a catastrophic failure, such as a rod blowing through the side of the engine block, you can probably imagine that your core isn't as valuable. If you have some corroded head studs, we have to replace them prior to rebuilding the engine. Basically, every part of your core has an assigned value—the cost that we pay to have that part replaced—and we strive to be as transparent about that process as possible. Our engine tear down checklist covers all the criteria and values of your specific core components. In other words, we're not trying to hide anything from you. Each part has a real-world value, a cost that we absorb to fix the issue, and one that we pass along to the customer.


"But," you say, "My engine was running just fine when I decided to replace my motor to a rebuilt engine. It should be a perfect core. Why am I getting dinged for these things and not getting my full core deposit back?" We do whatever it takes to make the engine we ship to you as perfect as humanly possible. Think about it this way: Let's say we get a "strong running" engine back as a core exchange. When we break it down, we find that two of the head studs are corroded. Now, technically, these studs aren't "broken" yet. We could choose to leave them as-is, rebuild the engine, and ship it out the door. But what if that was your engine? When one of those studs finally snapped—which would undoubtedly happen—you would expect Petroworks to pay to have it replaced, right? What if we simply said to you, "Oh, right, the head studs were not quite corrosion-free. Sorry that one broke, but you didn't actually pay for new head studs, so what are you complaining about?" Luckily, that's not how we operate. We choose to build our engines without cutting any corners. And since not every core needs the same work, we have a core deposit system that covers the worst-case scenario: that the core being returned is not rebuildable at all. The work that we have to perform on your less-than-perfect core comes out of the core deposit. That is exactly what happened to the core from which your engine was built.

Some of the core exchanges we receive are in great shape, and the customer is reimbursed the core charge deposit in full. But this is becoming exceedingly rare. Keep in mind that the newest cores we receive were built back in 1980’s. And translating engine years into people years is kind of like thinking about your dog in terms of people years. The newest engine core is probably about mid-40s in people years. Do you know anyone in their mid-40s who doesn't have a few blemishes?


In the end, we want to sell you an engine that you can trust 100%. We have a fantastic track record, so the proof is in the pudding. If we were to turn a blind eye toward the quality of the cores we receive, the next customer in line would receive an inferior motor. The question is this: What if that next customer was you?


It's not bad business to charge an engine core deposit. It would be bad business not to. The key to this whole process is transparency, and we demonstrate that in every facet of our engine-building process. Hopefully—after reading this and considering the information put forth—you'll agree with us that the engine core charge is, quite simply, a necessary evil.