But for a serious question, why does the HPL 0w30 supercar only meet API SL?
I regret not ordering this for the Pentastar. It looks like a very robust oil. After I ordered the HPL Premium Plus PCMO 0W-20, I stumbled on some additional info, and I can run higher viscosities safely in this engine.
@OIL_UDDER is an ex-Pentastar engineer, and he provided some beneficial information about these engines here on the forum. Still, I am confident that the HPL Premium Plus PCMO 0W-20 is very good motor oil.
Back on topic: The HPL Supercar 0w30 motor oil is rated API SL due to accuracy and honesty. That's the best way I can put it. The API has stringent guidelines for 0W-20, 5W-20, and 5w30 motor oils. And so does ILSAC. These motor oils are only allowed a certain amount of Phosphorus and must be fuel-efficient and energy-conserving (HTHS < 3.5, VII that temporarily shear, etc.). The way Supercar 0w30 was blended only qualifies it for an API SL rating. If it were a 0W-40, then the rating that applies to it is API SN because above 0/5w30, the API requirements are not as stringent.
I mentioned accuracy and honesty because other blenders, such as Red Line, for example, are a bit loose with how they rate their non-API licensed oils. If you look at Red Line High-Performance 0W-30, you will notice that it's rated API SN. However, it does not fit that profile due to high ZDDP (Phosphorus above 800ppm). Why do they rate it as such? Precisely to avoid questions like yours and lose out on sales. Because at the end of the day, when it comes to high-performance motor oils, that API rating doesn't mean anything.