Oil Consumption PARANOIA?!?!?!?!?!

FromG2Z

Alright fellow members. Please help ease my paranoia..... I think I am overthinking this.... but..........

This weekend, I got back from a week long vacation. Z was sitting that entire time. I check the oil (checked it previous times too of course, and level was at 3/4 like my previous oil change = no issue) before heading out for some errands, and I notice it's a little low. I *thought* it was at 1/2 stick. I had low lighting, was rushing, etc...thought nothing of it. Added some oil to tip of H, came out to be 1/2 quart.

Then I do more research then of course I read up on ALL the issues, plus the TSB, etc etc. So of course, now I am all worried that I have a consumption issue. I didn't properly measure (as I stated above) before I topped it off this weekend.... so was it REALLY at 1/2 stick?........ can adding 1/2 quart really make it reach the tip of the H??? or was it really still at 3/4 and I'm just retarded at reading sticks that afternoon. Grrrrr....

So anyways, I am thinking about having a Nissan dealer to an oil change to do a baseline check for oil consumption. I switched to Mobil 1 at about 270 miles. Did the oil change myself. She now has 1800 miles. Dealer has to do an oil change and record the levels for an "official" baseline check. So questions...

1) Do I EVEN HAVE AN ISSUE to begin with? Or is paranoia setting in?

2) Do I go forward with having them do an oil change? or just measure the oil myself (very accurately this time...lol) over a period of a few hundred miles and reschedule with dealer if I do indeed see a decrease in oil levels? I just don't like taking it to a dealer if not necessary. I like doing all the work myself, but obviously Nissan won't warranty (if indeed I do need it) consumer work.

3) If I do have them do an oil change, should I have them keep using Mobil 1, or have them switch to Nissan Ester to aid with warranty claims (even though it shouldn't make a difference)? Aren't there going to be issues with switching from Mobil 1 back to Nissan oil in terms of not being good for the engine itself?

I feel like option 2) is the best for peace of mind... but just the idea of taking it to the dealer sucks.... esp when I can measure it myself (accurately this time). Then again, I could be worrying about it the whole time I wait...

Thanks for advice guys.... I hate worrying.

p.s. I checked for engine noise, none exists. No issue with my car whatsoever in the past. Ever.

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2012 5.0 GT Prem, Kona Blue, 6MT, HID, Brembo, 3.73 -- Ordered: 9/20/11, Born on: 10/20/11, Delivered 11/15/11"Marilyn" GT500 mufflers/flaps, MGW shifter, FRPP K springs, BMR panhard bar, Boss coil covers, 3DC spoiler, Llumar Tint (35% and 20%), 3M ClearBra