Cetane improvement
Raises cetane approximately 5–7 points to support quicker ignition and smoother combustion.
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OVERVIEWBENEFITSTREATMENT & USECOMPARE FORMULASFAQ
Warm-weather diesel performance
Summer+ Cetane Formula
Cetane improvement, lubricity and fuel-system protection for drivers, fleets and equipment operating when severe winter anti-gel protection is not required.
Approx. +5–7 CetaneModern Diesel CompatibleConcentrated Formula
1 QUARTPackage
640 GALTreatment capacity
+5–7Approx. cetane points
1 OZ / 20 GALStandard rate
Why Summer+
Built for warm-weather diesel performance
A clear choice for buyers who want more cetane and dependable fuel-system protection without paying for severe winter anti-gel performance they do not need.
Lubricity protection
Helps protect injectors, high-pressure pumps and other critical components from wear.
Cleaner injectors
Helps clean injectors and reduce deposits for consistent fuel delivery and operation.
Water separation
Supports water separation and fuel-storage stability as part of routine diesel care.
1 OZtreats 20 gallons at the standard rate
Treatment & use
Simple dosing at every tank size
Measure the correct amount, add before or during fueling, and follow the current product label.
1 oz20 gallons
2.5 oz50 gallons
5 oz100 gallons
1. MeasureUse the treatment rate shown on the current label.
2. AddPour into the tank before or during fueling.
3. FuelIncoming fuel helps mix the concentrated formula.
Product education
What the formula is doing
Technical information presented as quick buyer guidance.
01
Why cetane matters
Improved ignition quality can support quicker ignition, smoother combustion and reduced engine noise.
02
Why lubricity matters
Ultra-low sulfur diesel may need added lubricity to help protect pumps and injectors from wear.
03
Why choose Summer+
Choose it when strong cetane and lubricity performance matter but severe winter anti-gel protection does not.
Important: Summer+ is a warm-weather formula. For preventive cold-weather anti-gel protection, use the appropriate Opti-Lube winter formula before fuel reaches its cloud point.
Choose the right formula
One Opti-Lube lineup, five different priorities
Use this guide to select the formula that best fits the operating conditions.
| Formula | XPD | XL | Summer+ | Boost! | Winter |
|---|---|---|---|---|---|
| Primary purpose | Year-round multi-function | Maximum lubricity focus | Warm-weather cetane + lubricity | Maximum cetane focus | Preventive anti-gel |
| Cetane support | Up to approx. 3 | Secondary benefit | Approx. 5–7 | Approx. 7–9 | Up to approx. 3 |
| Cold-weather role | All-season support | Not the primary purpose | Warm weather | Not the primary purpose | Cold-flow protection |
| Best fit | One-bottle routine care | Pump and injector wear protection | Higher cetane without severe anti-gel | Strongest cetane improvement | Winter prevention before cloud point |
Quick answers
Summer+ frequently asked questions
How much should I use?
At the standard rate, one ounce treats 20 gallons of diesel. One quart treats up to 640 gallons. Always follow the current product label.
Can I use it in common-rail diesels?
Summer+ is intended for diesel fuel systems, including high-pressure common-rail and other modern diesel applications, when used as directed.
Is Summer+ an anti-gel?
It is intended for warm-weather performance and does not provide severe winter anti-gel protection. Use the appropriate Opti-Lube winter formula for cold-weather prevention.
When should I add it?
Add Summer+ before or during fueling so the incoming fuel helps distribute the treatment through the tank.
Summer+ configurations
Choose the package that fits
Filled Summer+ products and a practical pump kit—no standalone empty bottles or spigots.
