

GM dexos R Raises the Motor-Oil Bar for High-Performance Engines
AMSOIL Signature Series already outperforms the new motor oil specification.
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Oil viscosity is the measure of its resistance to flow. How quickly or slowly motor oil flows affects how well it protects your engine.
Learn MoreAlthough you might know that synthetic oils outperform conventional oils, you might not understand why. The differences begin at the molecular level.
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