Before Driving Your Mazda; Fuel Requirements; Fuel and Engine Exhaust Precautions- Page 70

2002 Mazda 626 Owners Manual

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Before Driving Your Mazda

Form No. 8Q50-EA-01G

Fuel and Engine Exhaust Precautions

Vehicles with catalytic converters must use ONLY UNLEADED FUEL, which will reduce 
exhaust emissions and keep spark plug fouling to a minimum.

Fuel with a lower rating could cause the emission control system to lose effectiveness. It 
could also cause engine knocking and serious engine damage.

Your Mazda will perform best with fuel listed in the table.

*U.S. federal law requires that octane ratings be posted on gasoline station pumps.

2.5-liter engine

You may use a regular unleaded fuel with Octane Rating from 87 to 90 (91 to 95 RON) but 
this will slightly reduce performance.

Fuel Requirements

Engine

Fuel

Octane Rating* (Anti-knock index)

2.5-liter engine

Premium unleaded fuel

91 [ (R+M)/2 method] or above (96 RON or above)

2.0-liter engine

Regular unleaded fuel

87 [ (R+M)/2 method] or above (91 RON or above)

•

USE ONLY UNLEADED FUEL.
Leaded fuel is harmful to the catalytic converter. The lead will accumulate on the 
oxygen sensor and the catalyst inside the converter. This will result in a malfunction 
of the emission control system, causing poor performance.

•

Your vehicle can only use oxygenated fuels containing no more than 10% ethanol by 
volume. Damage to your vehicle may occur when ethanol exceeds this 
recommendation, or if the gasoline contains any methanol. Stop using gasohol of any 
kind if your vehicle engine is performing poorly.

•

Never add fuel system additives. Never add cleaning agents other than those specified 
by Mazda. Other cleaning agents and additives may damage the system. Consult an 
Authorized Mazda Dealer.

CAUTION

J94S.book  Page 2  Saturday, June 23, 2001  1:04 PM

Detailed Information for 2002 Mazda 626 Owners Manual

Lists of information found in 2002 Mazda 626 Owners Manual - Page 70

  • 2.5-liter engine You may use a regular unleaded fuel with Octane Rating from 87 to 90 (91 to 95 RON) but this will slightly reduce performance.
  • 2.5-liter engine Premium unleaded fuel 91 [ (R+M)/2 method] or above (96 RON or above) 2.
  • USE ONLY UNLEADED FUEL.
  • Your vehicle can only use oxygenated fuels containing no more than 10% ethanol by volume.
  • Never add fuel system additives.

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