Reviews of OEM Hyundai head gasket

I just had my second head gasket replacement at like 110,000 miles, I looked at the invoice or receipt from Hyundai when i picked up the car… and tell me why the dealership is putting 5w-20 when it says 0w20 in the oil cap.. maybe that’s why their engines be blowing. :/ I have a 2021 Elantra se

I had a Hyundai i30N at 15,000 miles - 3 years old the head gasket blew when they took apart to investigate it was a fault in the moulding on the block I think from memory.