Valvoline full synthetic with max life tech is my current favorite but I think I might be able to unseat him soon.
I personally use 5w50 valvoline fully synthetic racing oil for my r56 and change every 5000 km which is like around 3k miles and it's running good
For the money the best zinc content is valvoline vr1 CONVENTIONAL (not synthetic). It comes in a few flavors.
I use Valvoline 0W-20 full synthetic and an OEM filter.
I used to run the 10w-40 Valvoline high mileage synthetic blend from Walmart.
I use conventional 20W-50 VR1 for oil, love it.
As a Shop owner that Services a ton of Euro Cars we pretty much use all the Valvoline Euro Spec'ed Oil. They meet all the OEM requirements as we've also sent it in for testing. I have a 2014 CC APR Stage 3+ and thats what I run, Valvoline 5W40 Euro. No Issues.
Valvoline vr1 20w50 I'm convinced they basically make it for rotary's to begin with.
I've been using the valvoline personally and like it better than the pennzoil platinum.
Used this for years in my 4 strokes. Quality oil.
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