PERFORMANCE THAT WORKS
Cetane Boost
Improves Fuel Economy
Completely Removes Water
Lubricates Fuel System
Cetane Boost
Raises cetane levels for better combustion, faster starts, and more responsive throttle. Feel the power every time you turn the key.
Fuel Economy Gains
Improves mileage by optimizing combustion and cleaning injectors. More work done with less fuel burned.
Cleans Injectors Fast
Breaks down carbon and sludge quickly to restore performance. Keeps fuel systems clean and firing right.
More Power. Every Fill-Up.
Formulated with a +7 cetane boost, Doc's Diesel 24/7 Treatment cleans injectors, restores lubricity, and delivers smoother starts and stronger performance in every tank.
More Power. Every Fill-Up.
Formulated with a +7 cetane boost, Doc's Diesel 24/7 Treatment cleans injectors, restores lubricity, and delivers smoother starts and stronger performance in every tank.
COMPARE OUR ADDITIVES
| Your Selected Treatment |
24/7 Diesel Treatment + Cetane Boost
|
Interval Diesel Treatment
|
Oil Friction Treatment
|
DEF Guard
|
DPF & Injector Fuel Flush
|
SOS Diesel Rescue
|
|---|---|---|---|---|---|---|
| When to Use | Every fill-up, year-round | Every 5,000 miles or normal service intervals | Add at every oil change or whenever extra engine protection is needed. | Ongoing DEF system maintenance or when DEF issues start | When regens increase, power drops, or emissions codes appear | Emergency use for gelled fuel, water contamination, or no-start situations |
| What it Does | Keeps diesel clean, lubricated, and running efficiently. Boosts cetane for smoother operation, easier starts, and fuel system protection. | Deep cleans the fuel system, clearing carbon and injector deposits. Restores power, improves fuel economy, and reduces regens. | Reduces friction, heat, and wear while protecting critical engine parts. Helps prevent injector stiction and improves cold-start performance under heavy loads. | Keeps DEF systems clean and working like they should. Helps prevent crystallization, reduces DEF-related faults, and protects SCR components. | Removes tough injector deposits, restores spray patterns, and improves throttle response. Helps balance injectors and reduce regens. | Restores diesel flow instantly by reliquefying gelled fuel and de-icing filters, effective down to -25°F. Helps prevent downtime and protect the fuel system. |
| Year-Round Maintenance Role | Everyday protection. Ideal for drivers who want simple, consistent maintenance at every tank. | The backbone of diesel maintenance. Keeps systems clean before problems start. | Oil-system protection. Extends engine life by reducing wear and strengthening the oil’s ability to protect under stress. | Preventive DEF maintenance. Use regularly to avoid costly emissions problems. | Corrective treatment. Fixes existing issues,not an every-fill product. | Emergency-only solution. Keep it on hand — hope you never need it. |
Customer Reviews
Engine running smoother, and better mpg, great product
I have to use this product a little longer to give a gain evaluation, but by some strange coincidence my 2022 jeep gladiator eco diesel is getting precisely 24.7 miles per gallon. I’ll update this in the future but also I would encourage doc to formulate a 30/0. I love this truck and hope to make it last so I’ll keep using doc’s secret sauce. I also got a full filter and oil kit. everything fit perfectly thanks.
My "new" 2016 Ram 2500 SLT Crew Cab Long Bed (with 32K miles on it) is the first diesel I've owned, and it has been a learning experience to say the least. My 1st mod was a new intake manifold to get the jump on the grid heater time bomb, but a couple of costly mistakes tanked my mpg and turned my purring Cummins into a sputtering hobbled nag. One new fuel rail and a couple of pricey sensors later and she's 90% back. But even with my lack of diesel experience I could tell the starts were slow and my mpg's were still lower than before. Doc's 24/7 in the tank made an obvious improvement in both areas. She fires up instantly now and I back over 22 mpg on the highway. I wouldn't have believed it if I hadn't seen it for myself. I'm a believer now. Thanks for all of your top-notch products!
Doc's Diesel 24/7 Diesel Treatment + Cetane Boost
Started using this and I am not sure but seems to give me better mileage. I am sure it is good for motor.
They worked Exceptionally well, I could feel the boost right away. Thanks Docs
was open when I received it and leaked all over the box during shipping
We have noticed a big difference in all our diesel vehicles performance and fuel consumption after using this product.
Noticed a fuel saving increase.
Exceptional service and great products.
Cheaper than arch oil
I’m not sure if I can make, but I just switched to this brand and it works great. As my time with this goes I will leave a further review.
I use this with every fill up and makes my truck run so nice. No issues
Doc's Diesel 24/7 Diesel Treatment + Cetane Boost
Doc's Diesel has excellent products, competitive prices, and outstanding customer service.
Convenient bottle. Seems to work fine. It hasn’t killed my engine yet, so I’ll give it thumbs up.
Changed out my crank case filter and started the 24/7 with Cetane Boost all from Doc’s. After several checks on my math I’m still coming up with 2.5 mpg increase and can hardly feel the engine idle on my 07 dodge with much improved throttle response.
Doc's Diesel 24/7 Diesel Treatment + Cetane Boost
WENT FROM 22MPG TO 28MPG 2019 RAM LIMITED MEGACAB
I JUST WISH IT HAD A BUILT IN FUNNEL OR CAME WITH ONE......
Great product will be buying again first couple of uses i could tell a power difference in the pedal and better fuel mileage this is definitely my go to!!!
its a great product. the bottle on the other hand is a pain in the **** impossible to pour into the tank without wasting some of the product.
I’ve ordered fuel an oil filters two times for my Ram 6.7. They arrived fast and I haven’t had any problems yet. Great prices!
Simple enough and it works
Last July I bought a 2025 ram 2500 to be set up for hot shot hauling. I quickly accumulated a lot of miles and at first the dealership didn’t even have oil or fuel filters in stock and of course none of the auto parts stores or oil change places like Valvoline carried them. Either the dealership eventually got some on stock but an oil just the oil filter cost me 89. 95, fuel filters was 250+ I could easily rack up 7K miles in three weeks so you could imagine the cost to service my pick up. Then I found docs diesel and they have my oil filter, my fuel filters, etc., for a fraction of the cost. I am very pleased and will maintain a customer for docs diesel. Not to mention the order and shipment are very easy and very prompt. I highly recommend docs diesel.
Stuff really works more hp and better fuel mileage it’s a fact amazing stuff
Great product
Doc's Diesel 24/7 Diesel Treatment + Cetane Boost
Fast service and great product. I will buy again
FREQUENTLY ASKED QUESTIONS
What’s your shipping policy?
We offer free shipping over $99 on all orders within the contiguous United States. Expedited shipping is available for an additional charge. Alaska, Hawaii, and Canada will have shipping fees.
Where does Doc’s Diesel ship to?
We ship to the U.S. and Canada! For Canada orders, any taxes, duties, or customs fees are the responsibility of the buyer. We handle orders in 1-2 business days, and most of the time in less than 24 hours if ordered on a week day. Depending on location, U.S. orders will arrive between 3-5 business days from your order. Canada orders typically arrive within 7-11 days.
What is your warranty?
View our Official Limited Warranty
Doc’s Diesel Filters meet or exceed Original Equipment Manufacturer’s (OEM) requirements. New vehicle warranties stay in effect when Doc’s Diesel filters are installed correctly and in conjunction to engine manufacturer’s recommendations.
Where is my order?
If you have not received your confirmation email us sales@docsdiesel.com so we can get everything sorted out ASAP. If you received a confirmation but no shipment email, we are still working on your order. Don't hesitate to email sales@docsdiesel.com if you would like more information and we'd be happy to check on your order. Please Include your order # in the email.
For Tracking information, it will be in your shipment email. Check the tracking # first or the latest updates. Doc's Diesel, just like you are at the mercy of shipping companies after a shipment leaves our warehouse. If there's been an issue with shipment we will happily work with you to figure out where the order is and what we can do to help. You can reach out to sales@docsdiesel and include your order # in the email. Thank You!
Why didn’t I get a confirmation email?
Sometimes an email may get sent to your spam folder! So don’t forget to check that. If you need more help to hesitate to reach us at sales@docsdiesel.com.
How do I start a return?
If you are unhappy with your purchase for whatever reason, and it's within 30 days from your purchase, you can return your diesel filters back to us. Item has to be in new condition. Once filters are received, we will refund your money (minus price of return shipping) within 2-4 business days. We will refund to your original form of payment.
To start a return, visit our Returns Center.
View Our Official Limited Warranty Policy
Thank you!