Question, what kind of engine oil to you use in your cars?

Not type (5W–20), but brand is what I’m talking about. My car has been using Mastercraft brand oil, and while it seems to be working well, I’ve heard from other people that the brand isn’t that great, so I may decide to switch.

In your autos, which brand do you guys use?

Valvoline for my Civic.

As long as the oil brand and type has the API/SAE Donut, it does not really matter if it is conventional, blended, or full synthetic. They all meet the strict standards set by API and SAE to perform as designed inside your engine.