I’ve had a few oil samples analyzed of ENEOS and the OEM 0W-8 and the results are promising at 3k intervals.
5-30 Valvoline restore & protect is working wonders on my 2.5. Visibly cleaning out deposits and engine running stronger
I switched to valvoline restore and protect on my 06 is250 and it’s working great. The valves are a lot quieter compared to the previous oil I was using which was Kirkland synthetic.
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
I used vavoline for my second oil change and so far so good
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.
If you want brand recommendation choose Valvoline Extended Protection 5w-20 every 4k miles.
Cummins uses Valvoline premium blue.
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