@Cornish_Blue.......you don't fancy selling your one?I think they (MB) did amend to three year Spark plug changes or around 40k. I will not be changing min for a while as I am only on 12k miles.
This is very subjective... You could be correct about the small end piston wrist pins, manufacturers are always monitoring failures, it's all a balance of failures vs costs as I am sure you know. You will be lucky to get anything out of Infiniti corporate, best ask the Nissan / infiniti techs about any technical service bulletins relating to engine issues.Cornish_Blue, have you ever heard of an issue with the M270's with 'Wrist Pins' where excess play in the piston connecting rods give out this kinda rattling/ticking sound? apparently it affected a certain batch of engines assembled at a Nissan plant. Or something.
It seems to be something the 'Merry Cans' experienced around 2016 ish but I've not been able to verify if any of our Q30's were affected; I e-mailed Infiniti Europe but didn't get an answer.
Reason I asked was mine makes an light 'ticky' sound but I have deduced this to be a common feature with Direct Injection Petrol Engines these days, it's certainly nothing of concern to me anyway.