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I have a stock excursion that I have just installed a sct tuner on. I have never had a problem with this truck before the tuner was installed. After i run the truck hard from 0-80 mph sometimes it will through code po2290.The truck runs great before and after the code comes on.The only thing I can think of is that the 5-40 Rotella T6 oil is to thin to be running with the programer. Am I wrong thinking this or may there be a different issue at hand?
 

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I've had that code with my Ex a couple of times on a high speed runs and my HPO stayed over 3700 (750 at idle) the whole time and mine has been running great for years. Plus that was done on a stock engine with a bypass module to get around the speed limiter.
 
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