$18.04
FREE delivery May 2 - 3. Details
In Stock
$$18.04 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$18.04
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from
Powersport Superstore
Ships from
Powersport Superstore
Returns
Eligible for Return, Refund or Replacement within 30 days of receipt
Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. You may receive a partial or no refund on used, damaged or materially different returns.
Read full return policy
Returns
Eligible for Return, Refund or Replacement within 30 days of receipt
This item can be returned in its original condition for a full refund or replacement within 30 days of receipt. You may receive a partial or no refund on used, damaged or materially different returns.
Read full return policy
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Payment
Secure transaction
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more

Diesel Doctor - Full Synthetic Diesel Fuel Treatment with Cetane Max - 4 OZ - Cleans and Lubricates Fuel System - Stops Diesel Fuel Problems

4.3 4.3 out of 5 stars 32 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Diesel Additives by Liquid Performance
$18.04
{"desktop_buybox_group_1":[{"displayPrice":"$18.04","priceAmount":18.04,"currencySymbol":"$","integerValue":"18","decimalSeparator":".","fractionalValue":"04","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"7soAAfXL%2FuLhSaJdeYrtpfr2QskYJzUQSzsBa%2B%2Fv%2BxkyeIhX2GFfJ8Ai%2BmYqQuCPlyfRkeJM7oaad8BmatuGK7RPPhLe%2BY435HUN5c4ugQcdc5BZmuIuHO5mytUr%2F1QRtvk1avq8IgyH32dZKIxwD2c7fMT3KL0wG5dnIG8LP8pWze7rTMUN8g%3D%3D","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}]}

Purchase options and add-ons

  • Keep Your Diesel Engine Clean - Diesel Doctor diesel fuel additive is a fuel system cleaner that cleans and lubricates your entire fuel system to increase fuel mileage and help your engine perform better under all conditions
  • The Ultimate Fuel Tank Cleaner - Diesel Doctor reduces smoking, removes harmful water from fuel, prevents growth throughout your engine, and boosts your Cetane by up to four numbers
  • Up to 3 Years of Protection - Our long-lasting formula acts as a fuel stabilizer for up to 36 months, keeping your fuel pump, carburetor, and fuel injector cleaner even after years of fuel sitting in your garage
  • EPA Registered - Unlike competitors who use a harmful petroleum-based formula, Diesel Doctor is fully synthetic, meaning it doesn't create any harmful smoke or carbon build-up
  • Made in the USA - All Liquid Performance products are made right here in the USA with premium ingredients and quality formulas you can rely on
› See more product details

Additional Details

Small Business
Shop products from small business brands sold in Amazon’s store. Discover more about the small businesses partnering with Amazon and Amazon’s commitment to empowering them.
Learn more
Small Business
This product is from a small business brand. Support small. Learn more

Buy it with

Liquid Performance - Diesel Doctor - Full Synthetic Diesel Fuel Treatment with Cetane Max - 4 OZ - Cleans and Lubricates Fuel
$16.84
Get it May 2 - 7
In Stock
Ships from and sold by Avid Cycles.
+
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Case of 3)
$70.56 ($0.18/Fl Oz)
Ships from and sold by Amazon.com.
+
Hot Shot's Secret Original Stiction Eliminator 32 Fluid Ounce Bottle
$28.45 ($0.89/Fl Oz)
Get it as soon as Friday, May 3
In Stock
Ships from and sold by Amazon.com.
Total price:
To see our price, add these items to your cart.
Details
Added to Cart
Some of these items ship sooner than the others.
Show details Hide details
Choose items to buy together.

Product Description

LP
LP

LP

LP

LP

Cleans & Protects

Diesel Doctor effectively cleans your fuel system, eliminates water, and boosts cetane to help your engine perform better. But the long-lasting formula doesn’t stop there, helping to stabilizing fuel for up to three years.

Better for Your Car, Better for the Planet

Our EPA-registered formula means Diesel Doctor cleans your engine without harming the planet, with a fully synthetic formula that creates no harmful smoke or carbon build-up.

Cleaner with Every Ounce

A single ounce of our highly concentrated formula treats up to 450% more than the leading competitor, helping you to keep your engine’s fuel system cleaner for less.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

Feedback

Liquid

Liquid Performance - Diesel Doctor - Full Synthetic Diesel Fuel Treatment with Cetane Max - 4 OZ - Cleans and Lubricates Fuel System - Stops Diesel Fuel Problems

Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?
/
/
/
/
Please sign in to provide feedback.

Looking for specific info?

Customer reviews

4.3 out of 5 stars
4.3 out of 5
32 global ratings
It only takes a little
4 Stars
It only takes a little
At first glance this product seems pretty expensive: however after reading that it will treat up to 40 gallons of fuel it's not so expensive after all. Keeping the fuel system clean in any engine is of primary importance. A clean system gets more miles per gallon and more power. This little bottle of fuel treatment helps to keep injectors and fuel lines clean and also keeps diesel fuel stabilized, meaning that it doesn't try to break down and become useless for up to 3 years. There is no way of knowing how well it works since it takes time to work and it's hard to see inside of a fuel system but judging from the product specifications I believe that it's a good product at a fair price, since a little goes a long way.
Hide
Thank you for your feedback
Sorry, there was an error
Sorry we couldn't load the review

Top reviews from the United States

Marianne Gill
5.0 out of 5 stars Five Stars
Reviewed in the United States on July 29, 2015
Verified Purchase
works great! super fast shipping!
Helpful
 Report
Tennessee Granddad
5.0 out of 5 stars This seems to be a great diesel fuel additive
Reviewed in the United States on March 11, 2023
Vine Customer Review of Free Product( What's this? )
Reviewing something like a diesel fuel additive is really difficult. Unless you have years of experience with it, you can't judge its performance from personal experience. You can only go by what the manufacturer claims. But can you trust those claims? It's hard to tell. So I went to the Liquid Performance website and looked at the information given about Diesel Doctor. I was pleasantly surprised to find detailed reporting of multiple ASTM test results, which definitely back up the claims made. I also tried to do this for the leading competitive fuel additive that everyone is familiar with and that I have used for many years - call it Brand S - and found nothing but marketing verbiage; no test results at all. So Diesel Doctor wins the transparency competition.

Comparing performance claims: Brand S lubricates and cleans the fuel system, prevents sludge and sediment formation, helps remove water and prevents corrosion, keeps diesel fuel fresh for up to 12 months during storage, and works with all types of diesel fuel. Recommended dosage is 1 ounce per 10 gallons for treating fuel in your vehicle's tank and 1 ounce per 5 gallons for long-term storage. The additive itself has a shelf life of 2 years after opening.

Diesel doctor claims the same things, but stabilizes diesel fuel for 3+ years instead of 12 months. In addition, it also reduces the gel temperature of the fuel, boosts the Cetane rating by 4+ points, and prevents algae growth. Recommended dosage is 1 ounce per 10 gallons of fuel. A higher dose is not specified for long-term storage, but a dose of 1 ounce per 5 gallons is recommended for deep cleaning the fuel system and preventing gel formation at extremely low temperature. There is no stated shelf life of the additive after opening.

The per-ounce price of Diesel Doctor is very high when purchased in the small 4 ounce bottle. However, larger containers are also available (check the Liquid Performance website) at a much more competitive price. Whether or not Diesel Doctor is the right choice of additive depends on your performance needs and preferences, but it's great to have another excellent product to chose from.
Helpful
 Report
John P
4.0 out of 5 stars What Interest Me is the Vapor Corrosion Inhibitor Properties.
Reviewed in the United States on March 20, 2023
Vine Customer Review of Free Product( What's this? )
It is pretty much impossible to make any statements about how well this product works, especially with only a few ounces to try. It makes good claims, especially in regards to stabilizing fuel for three years.

What really caught my attention though, was its claims about it having vapor corrosion inhibitor properties.

I have some tractors and other equipment with steel caps where I get rust on the caps from condensation. I am hoping this product will help eliminate that.

Only time will tell. Unfortunately this product is far from economical when sold in the small bottle like this. I cannot find larger amount for sale on Amazon at this time. It is available form the manufacturer for $99 a gallon with free shipping. A gallon will treat 1280 gallons at the standard treatment rate. Hopefully Amazon will add the larger quantities to their site.
Helpful
 Report
J. Watter
5.0 out of 5 stars Haven't had a problem
Reviewed in the United States on July 27, 2023
Vine Customer Review of Free Product( What's this? )
Truck is running great.
Helpful
 Report
tonymcc
3.0 out of 5 stars Seems Expensive
Reviewed in the United States on March 14, 2023
Vine Customer Review of Free Product( What's this? )
In very cold weather, it's good to add anti-gel to diesel fuel. We've passed by trucks on the side of the road and kept right on going. This also contains Cetane boost, so it's more than just anti-gel. However, compared with other diesel additives with Cetane boost, this seems to be more expensive.
Helpful
 Report
D.L.
5.0 out of 5 stars Inexpensive insurance against bad fuel
Reviewed in the United States on March 27, 2023
Vine Customer Review of Free Product( What's this? )
I ordered this on the recommendation of my diesel mechanic. He suggested using a fuel stabilizer treatment for the diesel fuel we use on the ranch. I have a 4 wheel drive, 28hp, diesel tractor. I get fuel in 5 gallon cans, typically three or four cans at a time, so the fuel may sit for a month or more prior to use. A fuel treatment like this helps keep the fuel fresh, which ultimately helps the tractor run better.

This is my first use of this product, so far it seems to work well. I'll know more once we've run it in the tractor for a while. If it helps keep the fuel fresh and improves engine performance it will be well worth the price.

I will update this review should anything change - so far I am pleased with the product and the price.
Customer image
D.L.
5.0 out of 5 stars Inexpensive insurance against bad fuel
Reviewed in the United States on March 27, 2023
I ordered this on the recommendation of my diesel mechanic. He suggested using a fuel stabilizer treatment for the diesel fuel we use on the ranch. I have a 4 wheel drive, 28hp, diesel tractor. I get fuel in 5 gallon cans, typically three or four cans at a time, so the fuel may sit for a month or more prior to use. A fuel treatment like this helps keep the fuel fresh, which ultimately helps the tractor run better.

This is my first use of this product, so far it seems to work well. I'll know more once we've run it in the tractor for a while. If it helps keep the fuel fresh and improves engine performance it will be well worth the price.

I will update this review should anything change - so far I am pleased with the product and the price.
Images in this review
Customer image Customer image Customer image Customer image
Customer imageCustomer imageCustomer imageCustomer image
Helpful
 Report
brian
1.0 out of 5 stars Add is kind of misleading
Reviewed in the United States on June 27, 2020
Verified Purchase
The add shows 3 different size bottles, at a glance one would think that the item being ordered comes in the biggest container. Not so, its the smallest. Way over priced.
One person found this helpful
Helpful
 Report
Cmarv
5.0 out of 5 stars Works well .
Reviewed in the United States on March 15, 2023
Vine Customer Review of Free Product( What's this? )
I have 3 Duramax trucks , an 02 plow truck that sits most of the time , an 05 that's my shop truck and an 18 that's my personal ride . We didn't get one plowable snow this winter so the old 02 has sat a lot . I treat the fuel in all 3 and when I got this I wanted a good test , I took the ole plow truck up to fill it as it was at about a half tank and was running with a bit of a "lope" from settin' . It has a 34 gallon tank so I just dumped the whole bottle in before I filled it . By the the time I got back to the shop (6 miles) it had smoothed out and was perfect . I have ordered a jug of it , it's good stuff . I recommend it 100% with two thumbs up !
Helpful
 Report