Description Calibration Oil 'C' is a blend of specially selected and highly refined mineral oils and additives. Application Calibration Oil 'C is recommended for use in certain diesel injector calibration equipment. Additional information Calibration Oil is manufactured very close to the 'C' viscosity limits and is fully approved against Lucas CA70-10-100. Specification. Storage All packages should be stored covered. Where external storage is unavoidable, drums should be placed horizontally. Avoid possible water ingress and erasing of drum marks. The products should not be exposed to over 60oC, hot sun or freezing conditions.