Not sure.. They are supposed to detect it and adjust the timing accordingly, but it's possible that the mix you have is confusing it.
I've mixed 98 and 95 quite a bit and never noticed it happening on mine.
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Hers - D2 '98 A8 4.2 Quattro Sport - Silver, retrofitted Xenons, replica 18's & a PhatNoise (now off to a caring new home)
Mine - D3 '03 A8 4.2 Quattro SE - Silver with 19" 12-spokes. Sport seats & suspension, ACC
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