Hi, I drive beloved 2007 G35x... I've been hit with economy so I've been putting off lot of maintenance of my car. (Yeah I know...)

I need to get
-engine oil changed (w/ filters), thinking about 10w-30 royal purple


-Living in Philly, those stupid manholes took my undertray... It literally fell out. (not sure if I absolutely need to get a new one, if so... where can I buy it @ fair price? don't wanna spend over $200 for those)

-my LH headlight is flickering and my fog light is on/off time to time... I just had my LH headlight ballast and wires replaced. Maybe it's the bulbs?

-I def need to get new tires... it's WAY overdue. I am running Eibach lowering spring kit. (Stock 17' wheels) I am thinking about going wider than the stock (I want those aggressive look from behind, if you know what I mean...) Since my car being the X model, obviously all 4 tires should be the same size. I am not a tire guy, and I've done some research, but most people are just saying... go with the factory. Well, I could do that, but I don't see why it would hurt to go littler wider than stock suggested tires. What should be the "MAX" widest rubber size (that's what she said ) I can go with those stock 17' on G35X?

-Also, I think my belt is time to be replaced as well... It's been never replaced before.

-I've done engine coolant flush and Transmission oil changed @ 75k.

Did I miss any other maintenance on my To-Do list?

Thank you in advanced!

 

You went 75k without changing your belt? Wow. Although mine exploded at 60k if I remember correctly
You should really change your belt so you don't have to spend 500 bucks fixing the pulleys when it snaps..

This was with ~40k miles...

Also, don't forget about your differentials...

 

+1 on diff fluid also inspect all your bushings very common issues with them

 

+1 on servicing the diffs.

Don't forget to flush the brake fluid also.

Easy enough to flush the PS fluid too.

The engine belly pan can be purchased from a wrecker for a much more reasonable price, but even when new, it shouldn't run anywhere near $200: http://www.infinitipartsusa.com/2007...ds-s/12331.htm

Check your belt before you go buying one. Mine is nearing 70K miles and still looks fine; many more miles left in it, so even though you have more miles you might be able to go even further if you're in a pinch.

Check your battery electrolyte level. Add distilled water as needed.

EDIT:
Thought: if you have money for an aluminum belly pan (as seen in another thread), then the state of your economy can't be all that bad

 

Low on funds, watch the auto parts store newspaper adds/Costco for oil/filters on sale. Mobil1 is better for your car than Royal Purple. Check your local Nissan/Infiniti wrecking yard for your under tray. Tires? You're low on funds (remember) just buy what your G35X came with. Check with www.tirerack.com for what you need. I've saved you a few $$ now spend it on having Nissan install new belts, very surprised they've lasted this long. Yes, you missed Nissan's advice to change all fluids every 30K miles/Oil & filter every 3500 miles!
Gary