1. All overhead camshaft engines used in the Opel Ascona models in question have valve seats made of a material that allows the use of high octane unleaded fuel, provided that the following is met.
2. Using unleaded fuel may cause detonation at high engine speeds, which is not audible, but can cause engine damage. To prevent this from happening, the ignition timing must be reduced by 5 degrees. (see chapter 4).
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