The world's no. 1 engine oil brand is Mobile 1.
Mobile 1 engine oil brand is owned by ExxonMobil and is widely recognized as being the world's no. 1 motor oil brand, especially when it comes to synthetic motor oil.
Mobil 1 engine oil dominates the retail sales and is also the factory fill oil for many high performance vehicles.
Shell engine oil brand, which includes Shell Helix as well as Pennzoil is also the worldwide leader in engine oil, when it comes to total global lubricant market share.
Pennzoil is also known for it's innovative "Gas to Liquid" PurePlus technology, that yields exceptionally clean base oils.
Other popular engine oil brands are AMSOIL, Valvoline and Castrol engine oil.
AMSOIL, engine oil is praised highly among car enthusiasts for it's pioneering work in extended drain synthetic engine oils.
Valvoline engine oil is also one of the oldest names in engine and motor oil since as far back as 1866 and remains a favorite brand of engine oil for racing applications as well as engines with high mileage.
And Castrol engine oil is also a historical engine oil that is very popular.
Castrol Edge engine oil is also regarded very highly for it's strength under extreme heat and pressure.
For budget oils, Walmart's engine oil brand is also good and I use it in my vehicles without any issues.
The same with the Walmart brand transmission fluid.
As long as you change out your engine oil and transmission fluid often enough, most any engine oils will keep your engine running smooth.
And most transmission fluids will work just fine in your transmission as long as you use the correct transmission fluids.