Does this look like the redline oil you are using?
Acutally, I’m using that Redline in my RS6 & Cayenne Turbo, it has a lot of ZDDP but also a fair amount of Calcium. They have a Euro fomular with less Calcium for D.I. engines. For my S5 & RS5 (both D.I.) I’m using a botique oil, it’s called Quantaum Blue and it is in a 7.5w-40 grade. It is custom blended by a guy at BND Automotive LLC. There was another RS6 guy on the forums over there that started using it first and his Oil analysis came back outstanding so I swapped my 2 D.I. cars to Quantum Blue. A little price at around $25qt delivered but worth the insurance. The guy who owns the company is Brian Schubert, if you decide to talk to him get ready for a long phone call, he’s very enthusiastic about talking oil.
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Just chiming in a bit late here. I use AMSOIL 5W-40 MS 100% Synthetic European Motor Oil
https://www.amsoil.com/p/amsoil-5w-40-ms-100-synthetic-european-motor-oil-afl
*I’ve had no engine failures with AMSOIL over the years including my built Coyote motor that had a redline of 8300RPMS and was making well over a 1000HP.
From some other Oil analysis the Amsoil MS looks to be a pretty good oil but I’d like to see an Oil analysis for Calcium content before I’d want to use it in the RS5 with Direct Injection. If the Calcium is below 1000ppm then I’d use it, much higher then I wouldn’t due to LSPI.
The Coyote engine is DI with a low pressure upstream Injecto and I’d imagine with that kind of power it’s running pretty Rich. Just saying I’d like to see an Oil analysis first.