If you want brand recommendation choose Valvoline Extended Protection 5w-20 every 4k miles.
Cummins uses Valvoline premium blue.
Similar with my Audi but with Valvoline.
This weekend, the oil that's in it is coming out (it's clean) and Valvoline Restore and Protect is going in. Rationale is there will undoubtedly be deposits on the pistons, in the piston ring grooves and ring lands.
I see all these people shit talking the oil, but they haven't actually used it. I've used it, and it's great. I put it in one car (pontiac) with over 70k miles and it ran way better than with normal full synthetic. I got a 02 explorer with almost 200k miles, it was idling rough as hell. I thought it would need a tune up, spark plugs, ignition coils, oil change and air filter. One bottle later, started it up and it was almost silent.
Zic M9 10w40 fully synthetic ako for Honda Click. Changed oil every 2k km. 29k odo and never pa ko binigyan ng problema
I use Valvoline VR1 in my street car and whatever full synthetic that is on sale for my Taurus and Titan.
Just swapped over to Valvoline Restore and Protect in my N52 BMW daily driver with 215k miles. I drive a lot and am taking before and after photos inside the valve train. I have exclusively used Castrol Edge A3/B4 for years so I will have a true comparative.
Valvoline is the best oil I can recommend to you. Not even Royal Purple matches it in quality. They have a +75K miles and a +150K miles version of the oil. All of my cars are now on it after trying them all (Mobil, Royal Purple, Pennzoil, Castrol), the only one that effectively prevented oil burn and sealed any leaks in my other cars was Valvoline.
I personally prefer Valvoline, they seem to know what they're doing and have their own engine lab to test and experiment with oils, and that oil they made specifically for hi-milage engines work bloody good at rejuvenating a smoky old engine.
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