Race cars on track


Sunoco EXO2 is a very highly oxygenated race fuel. EXO2's high oxygen content - about three times as much as pump gas - can be beneficial in crate engines, two-barrel engines, and racing classes with cylinder head limitations, as well as engines running at higher elevations.

Due to its high oxygen content, Sunoco EXO2 requires a richer air/fuel mixture. Using EXO2 without proper air/fuel mixture changes can lean out your engine. Please consult the stoichiometric air/fuel ratio data in the Technical Details section below. Since non-oxygenated race fuels typically have a stoichiometric air/fuel ratio of 14.6:1 to 15.1:1, you may need to richen your fuel mixture by 10 to 15 percent when using EXO2 depending on the fuel you are currently using.

As with any gasoline, Sunoco EXO2 should be stored in opaque, tightly sealed containers and kept where temperatures are stable. Drum pumps should be removed immediately after use. Properly stored, the shelf life of Sunoco EXO2 is one to two years.

Note: EXO2's octane values must be estimated because of the extreme oxygenation of this fuel. The (R+M)/2 octane value of 110 is a conservative estimate as many engines that run 112 octane non-oxygenated fuels can successfully run EX02.


Legal in California only for racing vehicles in sanctioned racing events.


For off-road and racing applications only.

Technical Details

Color Light Orange
Octane (R+M)/2 110 Est.
Research Octane 115 Est.
Motor Octane 105 Est.
Specific Gravity 0.750
Weight (lbs/gallon) 6.3
Reid Vapor Pressure 7.3
10% Evaporation 139
50% Evaporation 160
90% Evaporation 225
Final Boiling Point 241
Stoichiometric Air/Fuel Ratio 13.2
Oxygen (Weight%) 10
HC Ratio 2.22
OC Ratio 0.1
Lower Heating Value (Btu/Pound) 16700
Lower Heating Value (Btu/Gallon) 102600
Leaded Yes


  • Asphalt Oval
  • Boats and Personal Watercraft
  • Dirt Oval
  • Drag
  • Miscellaneous Nitrous, Superchargers, Turbochargers
  • Motorcycle Road Course
  • Off-Road
  • Off-Road Motorcycle and ATV
  • Rally
  • Road Course
  • Truck and Tractor Pulling

Sanctioning Bodies

Tech Corner

Diving Deeper into Leaded Race Fuels

From the editors of Lead was legislated out of pump fuel...

Other Factors to Consider When Buying a Race Fuel

From the editors of How do you select the proper fuel...

One Way to Wade into the World of Race Fuels

From the editors of When do you think about making the...

View All