I've always used M1 0W-40. Is sometimes labeled European Blend pending what stage Mobil is at in their constant re-marketing/labeling cycle. Was the factory fill when it was new.

Chips (ECU reprogramming), oftentimes improves turbo lag.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)