Audi A4

Checking and Filling

Fuel

Types of Gasoline

The correct gasoline grade is stated on the inside of the fuel filler door. The vehicle is equipped with a catalytic converter and must only be driven with unleaded gasoline.

Audi recommends using TOP TIER Detergent Gasoline. For more info, visit www.toptiergas.com.

Gasoline grades are differentiated by octane ratings ((R+M)/2 = AKI, or RON). Examples from fuel filler door:

  • Regular: UNLEADED FUEL ONLY, MIN. (R+M)/2 87, MIN. RON 91. Use regular gasoline if premium is not available. Slight reduction in engine power.
  • Premium: UNLEADED FUEL ONLY, MIN. (R+M)/2 91 / SUPER MIN. RON 95. Recommended for rated horsepower and torque.
  • Premium Plus: UNLEADED FUEL ONLY, MIN. (R+M)/2 93 / SUPER PLUS MIN. RON 98. If unavailable, use premium 91 AKI / 95 RON. Slight reduction in engine power.

Note

  • Filling tank even once with leaded fuel or metallic additives permanently damages the catalytic converter.
  • Using gasoline with too low octane at high speeds or heavy load can damage engine.

Tips

  • Vehicle may be filled with fuel of higher octane than required.

Gasoline Mixture

Gasoline with Alcohol (Ethanol)

Unleaded gasoline with up to 15% ethanol (E15) can be used.

Gasoline Adapted to Season

Seasonally adapted fuels are recommended. Refuel at high-traffic gas stations when season changes.

Note

  • Do not use gasoline that does not meet specifications.
  • Do not use ethanol fuels > E15 (e.g., E30–E100).
  • Do not use methanol fuels > M5 (e.g., M100), engine and fuel system will be damaged.
  • Ask gas station operator if unsure about gasoline mixture.
  • Do not use unidentified gasoline mixtures; Audi is not responsible for damage or performance issues.

Gasoline Additives

Combustion residues may accumulate depending on fuel used. Use only approved TOP TIER Detergent Gasoline. Long-term use of incorrect fuels may impair engine performance.

Note

  • Damage or malfunctions from incorrect fuel are not covered by New Vehicle Limited Warranty.
  • Only Audi-approved gasoline additives may be used.

Refueling Messages

If the Ay indicator appears with a message, refuel immediately.

  • Ay Tank system: malfunction! Contact authorized Audi dealer or Service Facility immediately.

Fueling Procedure

  • Fuel filler door unlocked/locked by central locking system. Unlock vehicle if necessary.
  • Press left side of fuel filler door to open.
  • Unscrew fuel cap counterclockwise; place on open door.
  • Insert fuel pump nozzle fully into filler neck; begin fueling.
  • When nozzle shuts off first time, tank is full; do not continue.
  • Wait 5 seconds after nozzle shuts off before removing.
  • Turn fuel cap clockwise until it clicks; close fuel filler door until latched.
  • Check label inside fuel filler door for correct fuel type.
  • Refer to Technical Data (page 289) for tank capacity.

Warning

  • Improper fueling can cause explosions, fires, burns, and injuries.
  • No smoking; keep away from flames.
  • Ignition must be off; mobile devices and radios off.
  • Insert fuel nozzle fully to prevent leaks; spilled fuel can ignite.
  • Never enter vehicle while refueling. If needed, touch metal surface before touching nozzle to prevent sparks.

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