32-ounce bottle HT-1000 premium transmission fluid Engineered for extended maintenance intervals, providing up to 1,000 hours of operation before requiring an oil change Delivers excellent thermal stability for reliable performance even in high-temperature conditions HT-1000 premium transmission fluid is designed for heavy-duty hydrostatic applications, delivering maximum longevity and superior anti-wear protection for advanced hydrostatic drive systems Ariens HT-1000 Quart Hydraulic Fluid for Parker Hydro Systems