Refueling; Engine Oil; Fuel Requirements; Deposit Control Gasoline (Detergent Additives) - Volvo XC90 User Manual

2005 VOLVO XC90
pg. 86 Starting and driving

Refueling

ENGINE OIL

Although some oil consumption occurs during normal engine operation, more oil is consumed when the
engine is new as the internal parts generate higher friction while wearing-in to each other. From the time
the engine is new until the first maintenance is performed, the oil consumption could be higher than
normal. For this reason, it is especially important to check the oil every time you refuel your vehicle
during this period. See

Fuel requirements

Octane rating
Volvo engines are designed for optimum performance on unleaded premium gasoline with an AKI
octane rating of 91 or above. AKI (ANTI KNOCK INDEX) is an average of the Research Octane
Number, RON, and the Motor Octane Number, MON. ((RON + MON)/2). The minimum octane
requirement is AKI 87 (RON 91).

Deposit control gasoline (detergent additives)

Volvo recommends the use of detergent gasoline to control engine deposits. Detergent gasoline is
effective in keeping injectors and intake valves clean. Consistent use of deposit control gasolines will
help ensure good driveability and fuel economy. If you are not sure whether the gasoline contains
deposit control additives, check with the service station operator.
NOTE: Volvo does not recommend the use of external fuel injector cleaning systems.
Unleaded fuel
Each Volvo has a three-way catalytic converter and must use only unleaded gasoline. U.S. and Canadian
regulations require that pumps delivering unleaded gasoline be labelled "UNLEADED". Only these
pumps have nozzles which fit your vehicle's filler inlet. It is unlawful to dispense leaded fuel into a
vehicle labelled "unleaded gasoline only". Leaded gasoline damages the three-way catalytic converter
and the heated oxygen sensor system. Repeated use of leaded gasoline will lessen the effectiveness of
the emission control system and could result in loss of emission warranty coverage. State and local
vehicle inspection programs will make detection of misfueling easier, possibly resulting in emission test
failure for misfueled vehicles.
NOTE: Some U.S. and Canadian gasolines contain an octane enhancing additive called methyl-
cyclopentadienyl manganese tricarbonyl (MMT). If such fuels are used, your Emission Control System
performance may be affected, and the Check Engine Light (malfunction indicator lamp) located on your
instrument panel may light. If this occurs, please return your vehicle to an authorized Volvo retailer for
maintenance.
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