I think that it is difficult to get every drop of fluid out even if left draining overnight. The factory fill is 8L. You mention putting in 8L but don't state you checked the level with the factory dip stick tool. I think most DIY have put in something less than 8L generally.
The fill level and measurement temp are critical, are you certain it is not overfilled?
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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