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Other Products Product Data castrol.com/GPS 800 255 4417 May 2025 GPS Castrol ® Perfecto ® HT 5 Plus and HT 4 Castrol Perfecto Heat Transfer Oils are formulated from very stable paraffinic base oils that are fortified with noted high temperature oxidation inhibitors. Castrol Perfecto's high viscosity index coupled with a low pour point offers excellent circulation during cold weather startups, eliminates overheated pump motors and protects against hot spots (high fluid temperature in the heat exchanger). Other advantages are: • Low vapor pressure at elevated temperatures and a high boiling point to prevent pressure build-up. • Low carbon residue. • Non-foaming and excellent demulsibility. Applications: CASTROL PERFECTO HT 4 Recommended for application in closed circulation systems with temperatures up to 287° C (550° F). Castrol Perfecto HT 4 is particularly applicable where high transfer rates or good flow rates at fairly low temperatures are desired. CASTROL PERFECTO HT 5 PLUS Recommended for application in closed circulation systems with temperatures up to 315° C (600° F). Because of its solvency and high thermal stability, it serves as excellent turbine flushing oil. For application assistance, please call Castrol Heavy Duty Technical Service. Typical Analysis Perfecto HT 4 Perfecto HT 5 Plus Test Method ISO 22 ISO 46 Viscosity @40°C, cSt ASTM D445 20.2 46.5 Viscosity @100°C, cSt ASTM D445 4.0 7.1 Viscosity @100°F., SUS ASTM D2161 106 242 Viscosity @210°F., SUS ASTM D2161 39.0 51.0 Viscosity Index ASTM D2270 97 100 Flash Point, °C (°F.) ASTM D92 190 (375) 217 (422) Pour Point, °C (°F.) ASTM D97 -28 (-18) -23 (-10) Gravity, °API ASTM D287 33.5 31.6 Specific Gravity @60°F. ASTM D1298 0.8576 0.8676 Pounds per Gallon ASTM D287 7.141 7.224 H10 (Scastrof PERffCTO'HT 4 (Scastr~r PERFECTO HTS PC.US /S046 ecastrof