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Does the 2001 Audi S4 have an interference engine?

The 2001 Audi S4 has a non-interference engine.

This means that if the timing belt breaks, the valves and pistons will not collide. This is because the engine is designed with a different layout where the valves and pistons are positioned to avoid contact in case of a timing belt failure.

However, it is still crucial to replace the timing belt on schedule as recommended by Audi. Even though a broken belt won't cause catastrophic damage, it will render the engine inoperable, requiring a costly repair.