High‑Temperature High‑Shear (HTHS) viscosity is a critical parameter for engine oils, reflecting their ability to maintain film thickness under hot and high‑load conditions. The Auto Lubricating Oil HTHS Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. automates HTHS measurements in compliance with ASTM D4683 and JASO T606.

In modern engines and transmissions, lubricants operate under high temperatures and intense shear rates, where apparent (kinematic) viscosity does not fully predict film‑forming capability. The Apparent Viscosity Analyzer at High Temperature and High Shear Rate from Changsha Friend Experimental Analysis Instrument Co., Ltd. measures viscosity under combined thermal and shear conditions, offering insight into boundary‑film stability.

Under prolonged high‑temperature operation, lubricants can foam differently than at room temperature. The High Temperature Foaming Characteristics of Lubricating Oils Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. quantifies foam tendency and stability at elevated temperatures (up to 150 °C), replicating conditions found in gearboxes, turbines, and compressor bearings.

For large‑scale lubricant blending operations, rapid assessment of foam behavior across multiple formulations is essential. The Foaming Characteristics of Lubricating Oils Tester by Changsha Friend Experimental Analysis Instrument Co., Ltd. automates parallel foam testing to increase throughput without sacrificing accuracy.

Foaming in lubricating oils can impair fluid circulation, reduce heat transfer, and lead to cavitation in pumps. The Lubricating Oils Foaming Characteristics Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. provides a systematic method to measure both foam formation and collapse under controlled conditions, guiding formulators in selecting effective antifoam additives and ensuring reliable equipment operation.