Viscosity
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The GARDCO EZ Zhan cup meets and exceeds ASTM D4212. GARDCO EZ viscosity cups are calibrated, with a manufacturer\'s Drain Time Warranty of +/-3% based on standard oils of certified viscosity.
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 | An improved version of the Zahn Signature Viscosity cups, calibration of the S90 cups match the earlier Zahn Signature cups. |
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