Engine oil Mobil or VALVOLINE

I use the mobil1 0-40 in my non m z and also my diesel x5 it’s good oil readily availqboe for cheap at Walmart

I have used nothing but Mobil 1 FS for 20 years on all my cars and family vehicles. I’ve never had a reason to switch.

I've stuck with Mobil-1 changing it around every 5k miles and everything has been perfect.

Mobil-1 guy myself, at least so far. No issues, good price

Mobil 1, it’s better than 99% and you can get 4 quarts for $27 at Walmart.

Mobil 1 full synthetic 5w20 or 5w30 is best in my opinion, and I’ve always just used a fram ultra from Walmart never had any problems and my K20 seemed to enjoy it

The Hyundai owner manual also recommended Quaker State oil too  , to me all full Synthetic oil is the same , Quaker State oil have been around for a long time now its ok to use , do you know the brand Super Tech oil in Walmart those are new brand of oil but a lot of people loving its as long its full Synthetic , I have tried all others full Synthetic high mileage oil and end up with Valvoline & Mobile1 ,  I buy them whichever on sale

I highly recommend Valvoline high mileage full synthetic 5W-30 oil, with Mobil 1 oil filter, my Si K20z3 seems to run so much smoother for longer with this type of oil.

My changes have generally been religious at 5k and that didn’t save my GTI from losing compression in cyl3 at 37k untuned miles it suffered 15% leakdown vs the other 3. That car got M1 0w-40, tried and true stuff, so you just never know.

I used to use M1 0-40 in my VR6 Corrado, but the valve, chains and engine noise went way up, especially at a cold start