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confirmed 15w50. With that I live in Southwest Florida and seldomly see freezing temps. I am sure there are hundreds of threads on oil but in short the first number is the winter/cold viscosity the last number is the at running temp viscosity. If you are getting an engine from RK I'd ask him what oil would be best for your region.
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2015 F06 M6 Silverstone Metallic II, Individual Full Leather, B&O, Night Vis, CCB, RKAutowerks (CP Rods/Pistons, DI Cams, CF Intakes, Coated DP's & Billet Diff Brace), InfinityAuto Turbo Inlets, Mishi Oil Cooler, JB4, XHP S3, BM S3
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