Royal Purple 37520 HPS SAE 5W-20 High Performance Street Synthetic Motor Oil 55-Gallon Drum

Royal Purple HPS (High Performance Street) SAE 5W-20 is a fully synthetic motor oil engineered for high-performance and modified engines. Supplied in a convenient 55-gallon drum, this formulation is ideal for shops, fleets, and enthusiasts with high-volume needs. HPS is Royal Purple's most robust non-racing engine oil, delivering an elevated level of protection and performance beyond standard API-licensed oils.

The HPS formula is built around two core technologies: elevated ZDDP (zinc dialkyldithiophosphate) anti-wear chemistry and Royal Purple's proprietary Synerlec® additive technology. Synerlec works at the molecular level, forming high-strength ionic bonds with metal surfaces that respond to heat and pressure with increased film strength — rather than breaking down like conventional oils. Over time, Synerlec smooths microscopic surface roughness on internal engine components, reducing friction and improving long-term lubrication efficiency.

Key Features:

• Maximum wear protection — Exceptionally high film strength dramatically reduces engine wear and heat, extending engine life
• Elevated ZDDP anti-wear package — Enhanced zinc/phosphorus levels provide superior protection for flat tappet and roller lifter valve trains, and high-lift/high-ramp-rate camshafts
• Improved ring seal — Better sealing between piston rings and cylinder walls maximizes horsepower, torque, and fuel economy
• Reduced Low Speed Pre-Ignition (LSPI) — Advanced additive chemistry helps protect today's turbocharged GDI engines
• Extended oil drain intervals — Exceptional oxidation stability maximizes oil life in vehicles no longer under factory warranty
• Engine cleanliness — Advanced synthetic solvency reduces deposits and keeps internal engine surfaces clean
• Compatible with gasoline and diesel engines — Suitable for both fuel types, including modified diesel applications
• 55-gallon drum format — Ideal for high-volume professional and fleet use

Royal Purple HPS 5W-20 is recommended for vehicles that are no longer under the manufacturer's warranty, as well as for enthusiasts seeking a higher level of engine protection and performance. For vehicles still under warranty, Royal Purple offers its API-licensed oil line.