Doc's Diesel 5W-40 Full Synthetic Heavy Duty Diesel Oil | 4 Gallons | DOCS5W40-4
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Description
xOverview
Doc's Diesel 5W-40 Full Synthetic Heavy Duty Diesel Oil is engineered for modern diesel engines, from emissions-aware on-road rigs to durable older models. Formulated with premium synthetic base oils and CK-4 additives, it resists oxidation, helps maintain viscosity under high heat, and supports engine durability in severe conditions. The blend is designed to withstand challenges from EGR and DPF systems while delivering consistent performance across a broad temperature range.
What you get
- Excellent wear protection for high-mileage fleets and new engines alike.
- Oxidation resistance and controlled viscosity for dependable protection during long-haul or heavy-duty use.
- Fast cold-start protection for chilly mornings and startup moments.
- Stay-in-grade shear stability to help viscosity stay consistent under heavy loads.
Usage and maintenance considerations
- Follow your vehicle manufacturer's service intervals; typical ranges vary by duty: standard service often falls around 10,000–15,000 miles, while severe service may require more frequent changes.
- Suitable for on-road and off-road duties, including equipment with EGR and DPF systems, with robust performance across temperature ranges.
- In cold climates, benefits include quicker lubrication during startup and reduced wear at start-up moments.
Specifications and compatibility: Doc's Diesel 5W-40 meets API CJ-4/CK-4 and aligns with a broad set of OEM expectations, suitable for both new emissions-compliant engines and older diesel engines. Doc's also offers a complete line of filters engineered to meet or exceed OEM standards, providing a cohesive approach to maintenance and reliability.
FAQ
Q: Which engines and specs does Doc's Diesel 5W-40 meet?
A: It meets API CJ-4/CK-4 and aligns with multiple OEM requirements for both modern and older diesel engines.
Q: How often should I change Doc's Diesel 5W-40?
A: Follow manufacturer guidelines; typical ranges are 7,500–10,000 miles for severe service and 10,000–15,000 miles for standard duty.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. 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.
Shipping
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.
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- £258.81
- £258.81
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- £258.81
- £258.81
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- £258.81
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