We haven't had any problems with our 2nd engine... the 1st engine's failures were not oil related at all.
We've ran some 30 minute sessions on both engines, sometimes back to back. 5W30 300V for both engines.
I run 300V in my s2k, and while the oil does get toasty (with the factory cooler), UOA shows no problems, and my engine is still strong after 115k mixed miles.
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