Mobil 1 Definitely. 0W20 in my 2023 Sonata Limited. 5W30 in my 2014 Sonata Limited.
I do my own oil changes. dexos is pretty much a quality certification standard and I use Mobil 1 Fully synthetic 0w-20. I did my first change at 1,5k then at 5k and will do one at 10k. I always replace the filter and I have a magnetic drain plug to collect shavings that may pass through the filter in case it ever is compromised.
Ive always used Mobil1 oil and filter and have 130k miles on my Veloster
Avoid Castrol. Use Mobil1 or LiquiMolly.
I'm using 5w40 and never had issues overheating in summer but im not doing half hour pulls. No oil consuption also. With 5w30 when driving hard it was eating a lot of oil.
I use castrol 5w-40 Euro on my 2006 Revup. Good oil pressure on hot SoCal days and burns less oil.
I have an MX-5 with that engine, Mazda uses Castrol Edge 0w20 but you can use a heavier oil and sime say it reduces wear. The purpose of the 20 weight is fuel economy.
I live in Turkey vw service uses Castrol EDGE 5W-30 LL
Personally, I use Mobil1 oil in all my "regular" cars, and I often get a discount at O'Reilly when buying 5qts at a time. It's usually around $35 for a 5qt jug. That's pretty cheap.
So, the cause for VANOS to work as shit was an oil. I put Motul and engine drunk it like it was a water. After oil change to Castrol magnatec, engine works like a charm.
And one thing I would definitely do is get the Castrol out of there if you intend to keep the car long-term. The recent changes to the oil we are delivered at the dealer is crazy!!! It's not the same as it used to be and I can tell a huge difference in my cars. Have had excess oil consumption, lower MPG and quicker deterioration of the oil over last 6 months using Castrol(and I work at dealer)
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