I run valvoline motorcycle 20w50 in the primary and crankcase and valvoline 75w140 diff in the trans.
I always ran castrol gold motorcycle 20w50 on my Harley's.
I use Valvoline 20W 50 VR1 racing oil. It’s got a high magnesium content so well suited for the gearbox.
I always go for Castrol Edge. Always have, always will
On my ( 2006 Mazda 3s 2.3l auto sedan 350k miles ) I don't burn a single drop of oil and the car runs great even the transmission and I've been sticking to 5W20 Castrol edge extended performance all year
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.
My car is at \~7600 miles. I changed the oil at 500, 5000 and then I'll change it again at 10,000. I used Castrol Edge 5w30 for the first two and I'll use it for the third oil change as well. I'm going to send a sample of the oil at the 10k change to Blackstone Labs to see how the Castrol is doing.
I just found this thread. I have a 2014 Jetta 1.8t with 107k that I bought for my daughter two years ago and it burns through a quart of oil about every month. It dropped cyinder 1 similar to what the other person experienced, but new plugs and ignition coils solved the problem.
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