Antifreeze (engine coolant) formulations require careful balance of freeze protection, corrosion inhibitors, and thermal stability. The Antifreeze Analysis Instrument provides laboratories and service centers with a comprehensive suite of tests—freeze point, corrosion evaluation, pH measurement, and inhibitor concentration—to verify coolant health and ensure engine protection under variable environmental conditions.

Cold-weather performance of engine oils depends on low-temperature viscosity. The Low-Temperature Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. simulates oil flow under sub-zero conditions following ASTM D4684 or ASTM D2983 protocols.

Apparent viscosity at moderate temperatures is a regulatory requirement for engine oils. The Automatic Apparent Viscosity of Engine Oils Tester automates the ASTM D445 method at 100 °C to determine kinematic viscosity, then converts to apparent viscosity via correlation factors.

Auto Lubricating Oil HTHS Dynamic Viscosity Tester High-Temperature High-Shear (HTHS) viscosity governs oil film thickness under engine conditions. The Auto Lubricating Oil HTHS Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. measures viscosity at 150 °C and shear rates of 1,000 s⁻¹ to 1,000,000 s⁻¹ following ASTM D4683.

Closely aligned with standard foaming assessments, the Foaming Characteristics of Lubricating Oils Tester offers a high-throughput variant of the foaming test for production environments. Equipped with a multi-position holder, this tester runs parallel foam assays on up to four samples, accelerating quality checks.