I intend to do a 15K mile run on my GR86

Sounds like a solid warranty case to me.
Back when EP first came out Valvoline had a Q&A. Everyone was asking about extended drain. Valvoline has always been up front in saying they do not believe in extended intervals. Their guarantee fine print says 5k mile intervals.
 
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On my GR86. 4 Quarts Valvoline 5W-30 EP and 1 qt. Mobil 1 20W-50 V-Twin Oil. I will do a UOA every 5KI miles.
The Mobil 1 seems to do a good job.

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I thought you posted that you were going to run dealer 0w20 with 2 quarts of the lucas 20w50 motorcycle oil?


You have some fascination with mixing.
 
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