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I am as well. There is a huge knocking at the top of my engine. My warranty was voided out because I went 7k miles in between an oil change. They said it was too long (2k) mile difference. So my engine is not covered. I have been doing the additives oil change but I feel I may have one year with my 2017 model. Such a shame
Same here, 2017 as well, Had knocking under load. Truck went into limp mode without previous check engine. Ended up being sludge that clogged the intake actuator?? They are telling me needs engine replacement even though we did 3 engine flushes.

Please share your outcome.

Thanks
 

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You need to inquire with an attorney. You should be able to go 7K miles without sludging an engine to the point it needs replacement, if you have records to prove it was regularly maintained and the correct oil was used. How many miles are on the engine, where was it maintained, and what oil was used? Where's is the warning in your owner's manual that warns you of sever engine damage if you don't change the oil every 5K miles?
 

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If your service history shows oil changes, then escalate to the service manager. If other places (lube shops), then escalate to Infiniti Consumer Affairs.

I replace my own oil after 3.5k, but never write it down so I screwed myself if I ever need to show oil change history.
 
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