I can recommend Ravenol 5W-40 NDT oil, it's basically the best oil for the N57 (I assume also for the N47)
Change the oil at a minimum, and do it regularly. Use a quality synthetic high mileage oil and change it again in a couple thousand miles, then change on regular 5k mile intervals.
I have run 0w20 in my 2013 Mazda 3 skyactiv for 244,000 miles. It doesn't burn or leak any oil between changes. I change the oil and filters every 5-6,000 miles.
If you can get your hand on it try some Ravenol with UVSO, it's like bottled Magic. Engines run so smoothly with it, father in law thought the engine was off with it.
In the end I went with the spec - RAVENOL VMP SAE 5W-30
I personally am changing my own oil with full synthetic on my 23 2.5T every 6000 km or so. No need other than peace of mind for me. Doing it myself only takes 30 minutes and $35 in oil, filter and crush washer.
For [Naturally-Aspirated Skyactiv engines](https://en.wikipedia.org/wiki/SkyActiv), it is highly recommended that you use Mazda's own(Idemitsu) high molly GF-5 0w-20. [Arguably it is one of the best oil for skyactiv engines](http://www.cleanmpg.com/community/index.php?threads/45295/#post-357910).
First oil change at 15,000 kms. Went for Ravenol, it’s made in Germany and seemed like a superior choice.
Currently have Ravenol EFE 0w-16 in and have use Pennzoil Platinum, Eneos, and Idemitsu IFG7. I noticed bit of emulsified oil on the dipstick especially when I run in EV mode mostly. So definitely get it out on the highway on a daily basis if possible and get a used oil analysis. I have had 3 done and all three showed various 0w-16 oils shear down out of grade and their Flashpoints decrease.
Ravwnol e cea mai mare mizerie.
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