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I'm getting some rattling noise on the highway at constant cruising speed. Sounds like engine compartment and maybe lifters???? B12 chemtool maybe or something else. Was happening before and since oil change at 2500mi.
 

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The Mazda ecu would have pulled timing long before knock becomes audible. The injectors (ticking) and the high pressure fuel pump (rattling) are very noisy in direct injection Mazda's. Probably what your hearing.
 
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