If you think 0w-20 oil is bad, you're wrong...
 

I see a ton of talk about how 0w-20 oil is bad for engines, this is based off of nothing but uneducated guesswork and opinions. I autocross my Fit and drive it HARD during my daily commute. In May I had an autocross weekend where we had two events in a row, Saturday and Sunday, I decided to run the same 0w-20 oil for both events then another couple of thousand miles afterwards for daily commuting duties and then have the oil analyzed, results speak for themselves.

If you're running 0w-30 or 5w30 you're losing horsepower and efficiency. Stick with what the engineers recommend and make sure you're using high quality oil that meets the factory recommended API rating.
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@RJinVA Thanks for posting this report. I agree with you.

While all Internet oil discussions tend to get mental, the attack on 0W20 is really off the charts. I used to enjoy BobIsTheOilGuy, but the high-post-count bullies have settled in and you won't last a minute until you commit to switching to heavier all in all applications.

Are you auto crossing an auto trans or an MT?

The problem is that most oil discussions just involve Dunning Kruger effect individuals who are probably low IQ and overestimating their knowledge, skills, and abilities. They base it off their incorrect intuition, not science or accurate testing. I like "The Motor Oil Geek" on youtube, everything he does is backed by proper testing. More people should watch that channel.

Running an MT fit in autocross.

I'm going to take a more nuanced opinion of "it depends".

On the engine in question, the environment in which it's being operated, and how hard it's being operated as well as how frequent the oil is changed and even what era the engine is from.

The L15A for example, probably fine in a much more broad range of conditions than say a turbocharged 4G63 making 2-3 times factory output in summer being pushed hard on a road course. Annnd the rest all depends on so many variables I'm going to say that's the end of my commentary on this topic.

Is 0w-20 the manufacturer-recommended oil for a turbocharged 4G63 making 2-3 times factory output?

Comparing that to a stock Fit engine is sort of an apple to watermelon comparison, isn't it?

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In my experience, I'd agree. Our normal use 2013 Fit has 160,000 Miles on it and consumes very little oil, perhaps 1/4 to at most 1/2 QT every 10,000 Miles. That's just my experience; it may differ for others.

Thanks for the UOA. 0w-20 is all this little engine needs! Just like my 2012 at 163k.

I also have a GX 460 with a 1UR V8 engine, I run the factory recommended 0w-20 in that too and my UOAs for that vehicle are always excellent, also with the same Kirkland full synthetic. Too many people out there making blanket statements "0w-20 is bad!". My ultimate point, if you're not using UOA to determine what oil works best for your vehicle, you're doing it wrong. The vast majority of people will find that the factory recommended oil is just fine permitting it meets API requirements and is a quality product.