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Has anyone done a intake valve maintenance at the dealership to prevent carbon deposits or DIY themselves. I'm hitting 30k miles soon and was wondering if anyone has considered it. Im trying to avoid it getting so bad that walnut blasting is the only option.

has anyone here came from A 350z HR or 370z. Why is the new Z's engine significantly noisy compared to the previous generations. And does anyone else experience the slight engine rattle with light acceleration while engine oil temps are below 140f, usually after cold starts?

Guys I'm really desperate here. I know this sounds silly but I'm new to cars. From factory the oil on the dipstick was on the full mark after 5 3/4qt oil change my oil is now in the dead middle of dipstick. Is this ok??