It is well established that boxer engines want their oil changed and I do not think for a second that a visual inspection is valid for determining if it is time. Highly, **highly** recommend you change the oil per the manual without hesitation and regardless of what it looks like.
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.
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.
I use Valvoline VR1 in my street car and whatever full synthetic that is on sale for my Taurus and Titan.
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