Oil Change Alert
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The only way to know for sure would be to send it in to blackstone for oil analysis. It costs $20. From owning a Maxima however, I can tell you that Amsoil is generally good for up to 17k with a filter change halfway through or possibly twice. I went 10k with Amsoil. Mobil 1 EP will also be good for at least 10k with a filter change at 5k. I'm uncertain of other syns like Penzoil Platinum, Redline and the German Castrol Syntec. Stay away from Royal Purple. While it's a great racing oil, it's shown time and again it's not good for extended drain intervals past 5k.
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