Search  for anything...

Opti-Lube Summer+ Cetane Formula Diesel Fuel Additive: 4oz Bottles (8 Pack)

  • Based on 65 reviews
Condition: New
Checking for product changes

Buy Now, Pay Later


As low as $11 / mo
  • – 4-month term
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

Non-returnable due to hazmat safety reasons

View our full returns policy here.


Availability: In Stock.
Fulfilled by Opti-Lube

Arrives Thursday, May 30
Order within 5 hours and 22 minutes
Available payment plans shown during checkout

Size: 8 Pack


Features

  • MADE FOR OPTIMAL LUBRICATION: Your truck has been there for you every minute and every mile, which is why its important to keep it in pristine condition. At Opti-Lube, our goal is to keep your engine operating at its best. Our fuel additive helps to increase the lubricity properties of ultra-low-sulfur diesel (ULSD) so that you can play more and worry less.
  • IMPROVES FUEL ECONOMY: Trucks are known for eating up fuel. Fortunately, theres a way to fix that with Opti-Lube Summer+ Cetane formula. This diesel fuel additive has been shown to enhance fuel mileage year round, giving you more bang for your buck. With greater fuel economy, youll find increased power for summer driving.
  • CLEANS INJECTORS: When your fuel injectors build up with residue, your engine doesnt run as efficiently. Opti-Lube Summer+ Cetane formula cleans injectors while helping prevent future build-up. This helps to reduce deposits and emissions, making this lube compatible with all vehicle emissions systems. Additionally, it acts as rust and corrosion prevention to keep your vehicle in tip-top shape.
  • ENHANCES PERFORMANCE: Whether during rain or shine, Opti-Lube Summer+ Cetane formula delivers. It works to improve the performance of your truck all year round. This fuel additive also helps separate water from diesel fuel as a demulsifier and more than doubles the storage life of standard diesel fuel.
  • MADE ESPECIALLY FOR SUMMER: Summertime is hard on your fuel. The higher temperatures can cause faster thermal degradation of the fuel. Fuel prices tend to spike during the summer too, so youre typically spending more when youre at the pump. Our Summer+ Cetane is the best diesel fuel additive for warm weather and your wallet. It helps improve fuel mileage and helps prevent fuel breakdown.

Description

There are several benefits to using Opti-Lube Summer+ Cetane Formula Diesel Fuel Additive. This handy additive increases lubricity, improves fuel mileage, keeps your tank clean, and enhances your truck’s performance. Over time, build-up and residue occur within your fuel injectors, which decreases your truck’s efficiency. As this additive lubricates your fuel injectors, it helps reduce fuel system wear. This, in turn, creates a cleaner tank so that you can enjoy improved fuel mileage and a better running engine. Additionally, this additive prevents future build-up. It also fights against rust and corrosion, keeping your vehicle in pristine condition.This additive boosts cetane by up to 5 to 7 points. By increasing the cetane of your fuel, you improve cold starts and reduce engine noise. By reducing the ignition delay, cetane causes a more complete burn, which commonly results in increased MPG. With shorter delays, there’s more time for the fuel combustion process to be completed. This allows higher speed diesel engines to operate more effectively with higher CN fuels.Upon adding Opti-Lube Summer+ Cetane Formula, you’ll notice a significant difference in the way your engine runs. It will run more smoothly, giving you optimal performance.Each 4oz bottle treats up to 80 gallons of diesel fuel.This fuel additive is made specifically for ultra-low-sulfur diesel (ULSD).It’s time to upgrade your truck’s fuel capabilities by adding this fuel additive to your car care supplies. Order today!

Manufacturer: ‎Opti-Lube


Brand: ‎Opti-Lube


Model: ‎Opti-Lube Summer+ Cetane Formula Diesel Fuel Additive 4oz Bottles


Item Weight: ‎2.64 pounds


Product Dimensions: ‎9 x 3.25 x 7.5 inches


Country of Origin: ‎USA


Item model number: ‎OPT-SP4


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎OPT-SP4-8P


Date First Available: December 17, 2014


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, May 30

This item is non-returnable:

Non-returnable due to hazmat safety reasons

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • PayTomorrow Financing
  • Apple Pay Later
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • A must for EcoDiesels
Size: 8 Pack
I have had the unfortunate experience of owning a Grand Cherokee with a 3.0l EcoDiesel. This engine is notorious for having multiple class-action lawsuits related to Chrysler cheating to pass emissions and then subsequently issuing software updates that killed engine performance and fuel economy. After the AEM update, I was having ‘DPF Full’ warnings every 2,000-2,500 miles and fuel economy in the 24-mpg range. I started using Optilube to boost cetane and the performance has improved dramatically and I haven’t had a ‘DPF Full’ warning in 10,000+ miles. On long highway trips I’m getting 29-30 mpg again as long as I stay under 80-mph. Engine is running much smoother. If you have an EcoDiesel that was turned into a dog by software ‘fixes’; you really should give this product or any other cetane booster a try. ... show more
Reviewed in the United States on May 11, 2021 by JustinTN

  • Works great on my 7.3
Size: 8 Pack
Love this product! Immediate results in injector noise and start-ups
Reviewed in the United States on December 28, 2022 by Rob

  • Used in my 2015 Ram Cummins and my 2007 F250 ...
Size: 8 Pack with Opti-Box
Used in my 2015 Ram Cummins and my 2007 F250 6.0 Powerstroke. Saw noticeable increase in fuel mileage when using this product. Also seemed to make both trucks run smoother. Cheapest per tank fuel treatment that I have used that actually provided results. Will buy again.
Reviewed in the United States on March 18, 2017 by Amazon Customer

  • Exceptional product
Size: 8 Pack
These are the handiest supplement containers available. I went on a 5000 mile road trip and took these instead of bulk bottles. These don’t spill, no measuring, don’t have to put smelly bottle back in cab, all around good product. Increased my mileage by 1 mpg so it really paid for itself in fuel costs. ... show more
Reviewed in the United States on July 1, 2019 by Gary

  • I Recommend You Try This.
Size: 8 Pack
I’m pleased with this Optilube product and highly recommend it to others. There is a difference I can definitely see so I know it’s doing something. It’s also a lot cheaper per gallon on fill up than the other stuff I had been using. I had been using other brands sold in the box stores and none of them reduced the amount of ‘hazing’, I get out of my exhaust. It also sounds like idle is a lot smoother sounding, I haven’t noticed any worrisome ticking and/or surging. Oh and I can also say my mpg has gotten better too by a several tenths of a gallon, not a lot, but overall improvement is...improvement. ... show more
Reviewed in the United States on April 8, 2020 by MJF

  • Good cetane booster.
Size: 8 Pack
I initially purchased this for the added lubricity and cetane boost dont really care about mpg improvement so i never looked out for it. As fore as the cetane boost i can tell you my 2012 MB sprinter feels like i put in a tune chip or something. Great stuff, you deff feel the difference.
Reviewed in the United States on September 30, 2016 by SENS

  • Terrific deal!
Size: 8 Pack
Researched and found this to be highly recommended, and often referred to as the best quality additive for Diesel engines. This package will last me over a year! Cheap, high quality, quick delivery. Awesome!
Reviewed in the United States on December 31, 2016 by SgtBAXMAN

  • Improves gas mileage
Size: 8 Pack
This gave me a 1 MPG increase in fuel economy on my RAM 2500 Diesel, using 1 -2 oz per 20 gal of gas. It also helps lubricate your high pressure fuel pump. Small bottles have a sight gage that allows you to see how much you have added. I use a funnel to add it. The first time I did not and watched it empty onto the pavement as it by passed the fuel filler neck. Only drawback is it is expensive but it does pay for itself in improved fuel economy. Shipped very securely to prevent leaks. ... show more
Reviewed in the United States on October 14, 2022 by Jim J

Can't find a product?

Find it on Amazon first, then paste the link below.