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I’ve been running e85 in my FRS pretty regularly for about 4 years and haven’t had any issues. I once sent off an oil sample to Blackstone at 7,500 mi and they said it looked good and to try 9,500 miles the next time. So apparently oil contamination isn’t really an issue with e85 in this car. I sometimes run Shell 93 for long road trips and AutoX events which is probably good for the detergents.
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