Engine oil VALVOLINE or Shell

Quaker State oil is recommended in the Hyundai manual but you can absolutely use other brand too , i have used Mobil 1 / Vavoline / Castrol and Pezoil the end i picked Valvoline high mileage Synthetic oil the best of all all other brand the oil burn brown quickly

The oil type is likely fine, but the viscosity isn't. Ignore what the book says, get the 5W30 out of there. The PDs love to eat cams, and running 5W30 makes the problem worse. Me personally, I run Shell Rotella T6 5W40.

dude stick to the engine oil grade mentioned in the user manual and fill shell synthetic of that grade

I used vavoline for my second oil change and so far so good

Shell advance long ride or power you have two choices for fully synthetic trust me dude once you try shell there's no going back castrol is the worst for Royal Enfield and motul is better suited for high compression engines like KTM etc

20w 50 Valvoline VR1 is all I use. It’s expensive but because the gearbox and engine use the same oil you need a high zinc oil and VR1 is the best out there in my opinion.

I run valvoline motorcycle 20w50 in the primary and crankcase and valvoline 75w140 diff in the trans.

I use Valvoline 20W 50 VR1 racing oil. It’s got a high magnesium content so well suited for the gearbox.

I run Shell Rotella T6 15W-40 diesel engine oil in my Versys. It has all the ratings necessary for a motorcycle engine and a wet clutch, and it is a quarter of the cost of bike oils.

I refill about 1/2 qt of oil every 2500 miles.