I just changed my Mobil 1 Synth this weekend after 6600 miles. Looked like it could have gone another 1000. I'll probably stick to 6000, unless my driving habits change. I get on it quite a bit, I live 12 minutes from where I work, and about once a month take the 500 mile roadtrips.

 

I have an 04 QC 2wd. I run on Mobil 1 and change oil every 6000 miles. I change my oil filter every 3000 and add 1 quart.

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If you are going to change your oil to synthetic blend, the best time to change it would be anywhere between 10 and 15,000 miles, to ensure that all the parts are worn where they should be, although 7000 miles seems like alot its really not for a brand new engine. so i woudl reccomend changing your oil after 10,000 miles

 

There is no doubt in my mind that Mobil 1 is one of the best if not the best oil on the market.
I quit using it because I saw no increase in fuel milage and it's $5 a quart. And I don't feel comfortable going more than 3K on a oil change, no matter how good it is it still gets dirty.
I went back to Castrol GTX 5-w30. I put 143K on a 91 Ford Probe 4 cyl and never used a drop between changes with Castrol

 

You can get a lot of info and opinions here BOBISTHEOILGUY
I personally like to use Mobil 1 and change at 5k along with a Wix 51515 filter.

 

I drive an 04 QC Ram HEMI with 2WD and Sometimes I would tow a trailer over 10,000 lbs. I use Mobil 1 synthetic oil and I change it every 5000 miles. I use Pure-one oil filters.

 

I guess I'm just in old habits...I do the same thing.