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just put in the German Castrol 0w-30 found at AutoZone. i sh*t you not, it feels different from the mobil 1 i have been using since i bought the car. i have an idle knock issue, and it has decreased significantly. maybe its related or maybe im retarded, but i like it.
Mobil 1 0W-40 all year round. Its what my tuner recommends and I have read VERY good oil analysis reports regarding this oil from other boosted Z owners running it.