Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1.0 Fuels for Gasoline Engines: Notes
Use only unleaded gasoline in vehicles equipped with a catalytic converter.
Gasolines are expected to fulfill many requirements to guarantee the desired operating conditions during all environmental and driving conditions.
For application in BMW cars it is permitted to add up to and including 10% ethanol or other oxygenates with up to 2.8% oxygen by weight (i.e. 15% MTBE or 3% Methanol plus an equivalent amount of co-solvent). However, driveability problems may result from the use of such fuels, especially under certain environmental conditions such as high ambient temperatures and high altitudes.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.