07 G35X at 91000 km or 57000 miles.

- When should I do an engine coolant flush? I noticed that my coolant reservoir is running a little below MIN when the engine is hot. Should I add distilled water or premixed coolant to top it off in the meantime? What brand coolant do you recommend?

- When should I clean my throttle body? I only want to do this when necessary since I will do it at the Nissan dealership.... I just don't want to deal with idle problems.

- Are there any preventative maintenance I should do that's not mentioned in the manual? I already did Power Steering and Transmission Fluid drain and fill. Not sure if I'm going to or required to do the differentials as well.

Thanks in advance.

 

Coolant flushes are done at 30k, but u can go 45k. Top off as needed.

Only clean ur TB if ur rpm needle fluctuates while u are stopped at a red light or when the car is idle. It goes down ans comes back up if it needs cleaning.

 

I'd recommend a coolant change about now (or by 60K miles) as well as a brake fluid flush. If you haven't done so already, then you should change out the diff fluid as well (front and rear). As far as the throttle body cleaning goes, I wouldn't bother unless you're having symptoms that necessitate it, and I wouldn't worry about idle issues if you're planning on having it done at a dealership, as they will do the relearn for you.