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the change interval is dependent on your driving style (SEVERE vs NORMAL) , the ability of the oil filter keep oil clean and then of course the ability of the oil to provide maximum viscosity while still cleaning, providing heat shear resistance, etc.
I would call Royal Purple and ask what filters they recommend with their oil...and what their change interval is for your style of driving and vehicle. I can only vouch for AMSOIL.
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I have a high art, I hurt with cruelty those who would damage me. - Archilochus, 650 B.C.
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08 FJ Cruiser aka "Brick House", Nitto TG 295x70x17, BudBuilt Rock Sliders
84 FJ60, Blue, BFG, 2.5inch; lift, Warn hubs, etc
Lowcountry AMSOIL Products
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