Opti-Lube is the ultimate in performance diesel fuel additives, dedicated to protecting your equipment by providing exceptional lubrication in the fuel system (ranked first in an independent study, view it here). Summer+ Cetane is our best diesel fuel additive for warm weather and your wallet.

    Improving Lubricity is just the beginning, this product also improves efficiency, cleans injectors and boosts cetane by 5 - 7 points.

    “Why do I want higher cetane in my diesel fuel?”, you ask – By increasing the cetane number of your fuel you improve cold starts and reduce engine noise. By reducing the ignition delay cetane causes a more complete burn, this commonly results in increased MPG. Generally, diesel engines operate well with a CN from 40 to 55. As mentioned earlier, fuels with a higher cetane number have shorter ignition delays, providing more time for the fuel combustion process to be completed. Hence, higher speed diesel engines operate more effectively with higher CN fuels.

    For past news letters, studies/test, and other educational information please visit our Blog page.

*Available by the 4oz 8 pack, 8 oz. 6 pack, Quart, Gallon, 5-Gallon Pail and 55 Gallon Drum

  • Boosts Cetane by 5 - 7 Points
  • Enhanced Lubricity for Reduced Fuel System Wear
  • Improved Fuel Economy
  • Increased Power
  • Reduced Deposits
  • Reduced Emissions
  • Prevents Rust & Corrosion
  • Cleans Injectors
  • Improved Storage Stability (More than doubles storage life of diesel fuel)
  • Improved Water Separation

Summer+ Formula Treatment Rates

Premium Treatment Rate (higher lubrication and cetane): 1 to 1280 (1 ounce per 10 gallons of diesel fuel)

Minimum treatment rate: 1 to 2560 (1 ounce per 20 gallons of diesel fuel)

1 8 pack of 4oz bottles treats 320 - 640 gallons of diesel fuel

1 6 pack of 8oz bottles treats 480 - 960 gallons of diesel fuel

1 quart treats 320 - 640 gallons of diesel fuel

1 gallon treats 1280 - 2560 gallons of diesel fuel

5 gallon pail treats 6,400 - 12,800 gallons of diesel fuel

55 gallon drum treats 70,400 - 140,800 gallons of diesel fuel

  • Summer+ Formula: 4oz 8 pack

    Summer+ Formula: 4oz 8 pack

    $27.60
  • Summer+ Formula: 8 pack 4oz bottles with Opti-Box

    Summer+ Formula: 8 pack 4oz bottles with Opti-Box

    $43.16
  • Summer+ Formula: 8oz 6 pack

    Summer+ Formula: 8oz 6 pack

    $35.68
  • Summer+ Formula: 6 pack 8oz bottles with Opti-box

    Summer+ Formula: 6 pack 8oz bottles with Opti-box

    $51.24
  • Summer+ Formula: Quart

    Summer+ Formula: Quart

    $15.00
  • Summer+ Formula: Quart, Case of 12

    Summer+ Formula: Quart, Case of 12

    $180.00
  • Opti-Lube Summer+ 1 Gallon without accessories

    Summer+ Formula: 1 Gallon without Accessories

    $54.46
  • Summer+ Formula: 1 Gallon with Accessories

    Summer+ Formula: 1 Gallon with Accessories

    $61.76
  • Summer+ Formula: 5 Gallon Pail without Accessories

    Summer+ Formula: 5 Gallon Pail without Accessories

    $246.14
  • Summer+ Formula: 5 Gallon Pail with Accessories (Hand Pump & 4 Empty 8 oz Bottles). Pail will treat up to 12,800 gallons of diesel fuel. SKU: OPT-SP5

    Summer+ Formula: 5 Gallon Pail with Accessories

    $267.06
  • Summer+ Formula: 5 Gallon Pail, treats up to 12,800 gallons

    Summer+ Formula: 5 Gallon Pail with Accessories #2

    $286.92
  • Summer+ Formula: 55 Gallon Drum

    Summer+ Formula: 55 Gallon Drum

    $2,515.32