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I put Castrol 10W30 in my VX because an ad on here said low friction, what's everyone else using to improve MPG's?
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Use 5W in summer, 0W in winter. You could probably get away with 0W all year if you take 'er easy, but I don't think there's any reason to go above 5W. It's up to you to read up on the matter, so do that first and just take this as a nudge, not extensively researched advise.