Translating the viscosity is a good first step and can be sufficient for most general-purpose applications. This is a good approximation for most oils, but will lead to a small error when converting between ISO/AGMA and SAE for high Viscosity Index oils. The chart assumes the oil has a Viscosity Index of 95. Oil gets thinner according to its Viscosity Index, and the chart is calculated with a specific Viscosity Index (VI 95 default)
ISO VG measures oil at 40✬ and a given range to +/-10% of their stated value, so ISO VG 100 oil will have a viscosity between 90 and 100 cSt at 40✬.ĪGMA has redefined its grades to align with ISO standards, so they line up exactly. Oils grades that are on the same horizontal line (with the correct Viscosity Index) on the chart are equivalent. Several organizations (ISO, SAE, AGMA) have created competing standards to define oil viscosity ranges, but most of them mean the same thing.
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