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Whoa, wtf. Interesting finding... it seems S840A should not be taken lightly, perhaps. Some people on a Russian forum (which are FAR more advanced than us in terms of NCS Expert - most of the craze started there) are claiming that S840A is related to the secondary oil cooler; its presence signifies the presence of an oil cooler, but furthermore that it also raises the speed limiter from 210 to 237 and modifies some engine parameters to handle hot weather better. It, however, "causes slightly higher fuel consumption and slightly less power, but usually the difference won't be noticed by the customer".
Guess I'm not coding that. The ECUs listed on realoem.com seem to differ depending on whether you have this option or not.
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