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Motor gasoline

Brief description Petrol for cars (usually super plus (ROZ98) ) if it is used on an airplane

fossil, somewhat biogenic

Characteristic components

Gasoline, additives, bio-ethanol admixture

Physical state liquid

0.630-0.830 kg / L (20 ° C)

calorific value

8.9 kWh / L = 12.1 kWh / kg

Calorific value

34.6 MJ / L = 47 MJ / kg

Octane number

usually: 98 RON (super plus / super (Switzerland) / unleaded 98 (Switzerland))

Melting range approx. −45 ° C
Boiling range

25-250 ° C

Flash point

−21 ° C

Ignition temperature approx. 200-300 ° C
Explosive limit 0.6-7.6% by volume
Temperature class T3
Explosion class II A
Carbon dioxide emissions from combustion

2.36 kg / L

safety instructions
GHS labeling of hazardous substances
02 - Highly / extremely flammable 07 - Warning 08 - Dangerous to health 09 - Dangerous for the environment


H and P phrases H: 224-304-315-336-340-350-361-411
P: 201-210-280-301 + 310-403 + 233-501
UN number 1203
Hazard number 33
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Mogas (short for Mo tor gas oline) is the colloquial name for automotive gasoline , usually super plus (ROZ98) , when used in the aircraft.

Delimitation of aviation fuels

MOGAS is conceptually seen as opposed to AvGas (US English. Abbr. For " Av iation gas oline," ie aviation fuel), the classic hochoktanigeren , leaded gasoline for piston engine aircraft , which was formerly the almost exclusive aviation fuel. Both fuels must be distinguished from diesel fuel or kerosene , which are mainly used as fuel for jet aircraft .


While the American approval for unleaded petrol limits the maximum altitude for aircraft to 6000 ft (approx. 2000 m), there is no such blanket limit in Germany. Today, an aircraft approved under German law can refuel with any fuel for which it is specifically approved. This is done by means of a supplementary type certificate.

For this reason, the addition of bioethanol in motor vehicle gasoline and the associated risk of water excretion in the fuel at low temperatures is a considerable problem. It is already mandatory to determine the ethanol content beforehand using a sample every time a MoGas filling station is refueled. The ethanol binds condensation and humidity in the fuel and releases this bound water again at low temperatures. The pure water can get into the mixture preparation system ( carburetor , injection system ) unhindered and cause engine failures. For this reason, the maximum amount of ethanol allowed in aircraft fuel is prescribed by the aircraft manufacturer.

Many of today's propeller aircraft engines in private and business aviation can and may already be operated with MoGas, i.e. motor vehicle gasoline, as fuel; with other and older engines this is also possible in some cases after modification. In the aircraft there are corresponding notices on the tank cap as well as in the cockpit and the restrictions in the manual. For example: When operating with MoGas, maximum operating altitude is 10,000 feet.

While MoGas used to be exclusively super leaded DIN 51600 , it corresponds to today

  • the MoGas mostly available at airfields in the Super plus specification (ROZ98) , and
  • The petrol with the designation 82UL , for which some piston engine aircraft are approved, corresponds to the unleaded normal automotive petrol, but without its additives .

In addition to the better availability of MoGas, the advantage over the more expensive AvGas (100LL) is a large price difference and the fact that it is lead-free. For example, many ultralight aircraft or a Diamond Katana can be operated with MoGas, but also models from Cessna , Piper and other manufacturers depending on the engine and approval.

However, overhauled engines should be run in with AvGas 100LL for the first 25 hours so that the lead required to lubricate the valves and valve seats is supplied in this operating phase. Only the newer boxer engines (flat construction) from Lycoming and TCM no longer require a lead supply according to the specification.

Web links

Individual evidence

  1. a b c d e f Entry on petrol in the GESTIS substance database of the IFA , accessed on March 17, 2013 (JavaScript required)
  2. AAN Database: Enter AAN No. 27742 to view airworthines approval note No 27742 (PDF; 52 kB)
  3. Presentation of the DAeC on the problem of the use of MoGas in aircraft (PDF; 1 MB)
  4. Flying with Mogas (G. Rauch) (PDF; 5 kB)