itschad you want the ILSAC starburst on whatever viscosity you wind up with. It's got the additives that get the job done.
I use Mobil1 synthetic products because I can usually buy them with a rebate. They have a reputation for quality, as do many other brands. Last year I tried 5W-20 and didn't like it so I'm sticking with 0W-20. My ambient operating temperatures range from -10℉ to 90℉ (-23℃ - 32℃).
It might be more important to focus your attention to a quality oil filter rather than motor oil. Though features such as a anti-drainback valve and metal end-caps indicate quality construction, I see them as over-rated. Focus instead on filtration particle size and capacity. Anti-drainback valves do not hold all the oil inside of a horizontally mounted filter, and filter media should be chemically bonded somehow to it's end caps. Whether the end caps are fibrous, plastic, or metal - the idea is that oil should not be able to flow around the filtration media unless it is filled up & clogged.
Focus on performance & specifications, not good looks. That's what I always say.
There's been discussions bordering on Holy Wars over this subject. In order to avoid typing out a short story, I'll suggest some reading from someone who knows tribology rather than go on from opinion.
Grab your favorite beverage, head on over to Bob Is The Oil Guy and read Motor Oil 101 and learn the basics of motor oil and what it's all about.
Sounds like Harry Potter stuff.
Originally Posted by itschad
Everybody likes a braggart.
Originally Posted by Fummins
View my fuel log 2015 Mirage ES 1.2 manual: 49.9 mpg (US) ... 21.2 km/L ... 4.7 L/100 km ... 59.9 mpg (Imp)