Mobil 1 is fine,There many discussion of synthetic all over this forum and the Web. If I'm correct 5w20 is the spec'ed oil. Stay with this grade for fuel economy. It is not a common grade found all over yet.Give it a year and it will be as common as 5w30 is now(found even in supermarkets).
I would allow Non-Synthetic for the breakin.(first 3-5 k miles) I would dump O/E fill oil/filter at 500-1000 miles. Then use one more Non Syn. fill.
By 5k miles Mobil 1 is good. then continue your 5k intervals with Mobil 1.
Just my slant on this. Been doing this for all my cars including my last 9 Toyotas.
The first early miles of the O/E oil is the most contaminated and really
overburdens the Filter. That's why I dump it early. But yu still want Regular dino oil for at least 3k miles in my opinion.
The rings seat for the first 500 miles...but the valvetrain and main bearings etc. continue to breakin through at least 3,00 miles.
Best fuel economy occurs
after that, but varies on the engine and driving habits and conditions.
The characteristics/adavantages of Synthetic oil come into play after breakin. Some use Synthetic from the get go. Not a great issue for or con.
But I feel strongly that any FULL Synthetic Oil prolongs the breakin process.
There is much debate on this read up.
Some will even say wait til 30k miles.
I disagree.
LifeTech