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I just did an oil analysis with Blackstone Labs and at 5,000 miles the tech said I could extend to 7,000 on 5w30 royal purple. I do have a z1
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I just did an oil analysis with Blackstone Labs and at 5,000 miles the tech said I could extend to 7,000 on 5w30 royal purple. I do have a z1 25 row oil cooler so I'm sure that contributes to longer oil life.
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