[OP 09NOV2015]
For those interested, I am posting my UOA results. Oil is Motul 8100 X-cess 5W40 with 4,000 miles. About 3,000 miles were on E50, and about 1,000 on 91.
My car is FBO running JB4 and BMS BEF. I run map 6 which completely maxes out the turbo when E50 is in the tank, and map 5 when on 91. About 3,000miles was with an AFE dry drop in filter and 1,000 miles with an Injen intake. This oil sample also included a day of 1/2 mile racing at NFZ in Arizona where I ran at least 25 WOT runs up to about 144 MPH in 85 degree weather.
My plan is to change the oil every 5-6k, but my research showed differing opinions on the impact of E85 on motor oil. So to be safe, I completed an oil change at 4k miles and sent a sample out for analysis. Per the results, it seems I can go easily up to a 6k OCI and that the Motul X-cess oil is holding up well.
I would be glad to hear any additional comments from others on the results and hope this helps answer questions others may have on running e85 or this particular oil.
[END OP 09NOV2015]
[UPDATE 14FEB2017]
My current oil was at 12 months so I decided to have another UOA completed. This sample is also Motul Xcess 8100 5w-40. Mileage on the oil was only 3,225, but this sample included six 20min sessions at buttonwillow raceway where my oil temps hit 280 degrees on multiple occasions. Seems like this oil is performing well as expected so I will most likely stick with this brand. Any comments are welcome.
[END UPDATE 14FEB2017]