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Originally Posted by malter2.0
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In both situations it was high altitude and high heat. Did anyone ever read the codes to see what was the trigger? No, so for all we know in these two isolated instances the limp mode may have been a function of emissions, fuel starvation or the turbos boost pressure going too a level deemed to high which was done to compensate for the the thinner hot air.
My guess would be the latter as in one of those tests an AMG had the same issue. From my experience the E60 M5 had issues on heat baked tracks with short straights and that was an NA engine.
Outside these two situations (one also reportedly had been low on oil IIRC) there have been no noted issues and honestly in Spain it was blistering hot and the cars would have had issues if heat was the lone inducer of the "limp mode"
Two cars in probably 2,000 track occurrences for the new M5 is nothing. Doing 25 laps at full tilt on the 'Ring with no issues is what its about and these are street cars, not full on race cars- they never were.