15W-40 Full Synthetic Heavy-Duty Diesel Oil
15W-40 Full Synthetic Heavy-Duty Diesel Oil
Couldn't load pickup availability
Doc's Diesel 15W-40 Full Synthetic Heavy Duty Diesel Oil is specially engineered for today’s hard-working diesel engines - whether you're running a new emissions-compliant rig or keeping an older workhorse in the game. Engineered for excellent wear protection, our oil thrives in severe operating conditions, ensuring that your engine stays protected under the toughest circumstances. With strong oxidation and viscosity control, it minimizes oil consumption while maximizing durability.
- Maximized Engine Protection & Longevity - Advanced additive system protects critical components and resists thermal breakdown, even under high-load, high-heat operating conditions
- Extreme Temperature Protection - Excellent low-temperature pumpability ensures fast lubrication and engine protection during cold starts and harsh weather
- Proven Clean Performance - Enhanced oxidation and thermal stability help reduce sludge and deposits, keeping your engine running cleaner for longer
- Engineered for Modern Emissions Standards - Formulated to meet the GHG 17 (Greenhouse Gas 2017) emissions standards for reduced carbon output and improved fuel economy
- Doc's 15W-40 Full Synthetic Diesel Oil Safety Sheet
- Doc's auto parts all have an OEM design, fit, and function that meet or exceed OEM Requirements
Fitment
- 2003-2018 Ram 5.9L/6.7L Cummins 2500HD, 3500HD, 4500HD, 5500HD
- 2011-2025 Ford 6.7L Powerstroke
- 1994-2010 Ford 6.0L/6.4L/7.3L Powerstroke
- 2001-2025 Chevrolet/GMC 6.6L Duramax LB7–L5P 2500HD, 3500HD
Share
FAQ
How long does shipping take?
Most products ship in 3–7 days. Some will take longer. If a product needs more time, it will say so on its product page.
How do I know if a product fits my truck?
Each product page lists the year, make, and model it fits.
If you’re unsure, you can message us through our website, email, or Facebook, and we’ll confirm fitment for you.
Do you offer installation?
Yes. PSC Automotive & Diesel Repair installs everything we sell.
Call or message us to schedule an appointment.
What is your return policy?
- Returns accepted on new, unused items.
Some items are subject to a restocking fee, depending on the manufacturer.
Electrical parts, tuners, and custom-built items are non-returnable.
Full details are on our Refunds page.
What is your warranty policy?
Our warranty matches the manufacturer’s warranty.
If a part fails or has a defect, we will work with the manufacturer to get it replaced.
We do not warranty parts that were:
Installed incorrectly
Damaged by lack of maintenance
Removed or messed with after installation
Installed by another shop after we installed it
Full warranty details are on our Warranty page.
Will I get tracking information?
Yes. Tracking is emailed to you as soon as your order ships.
Check your spam folder if you don’t see it.
Do you offer customer support?
Yes! You can contact us anytime at:
Website chat
Email
Phone
Facebook or Instagram
We reply quickly during business hours.