Spark-Plug-Indexing-for-Direct-Injection-Engines-QEC-ES PDF

A technical documentation that focuses on spark plug indexing for direct injection engines in Mercedes-Benz vehicles. It emphasizes proper installation, specifying the correct orientation and torque required for effective functioning. The document compares an approved Mercedes spark plug with an unapproved NGK plug, highlighting differences in thread length and heat range. Incorrect spark plug use is shown to have caused significant engine damage, stressing the importance of using approved parts to avoid costly repairs.