Mobil 1 5W-30 is perfectly fine for the Z. But try this, put some Redline in at the next change and see if you find a noticeable difference in how the car runs.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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