TRUEGARD R&O 320 - 55 GALLON DRUM

ISO VG 320 is a high-viscosity grade, making this oil well suited for heavily loaded, low-to-medium-speed gearboxes and plain bearings that require a thick oil film to prevent metal-to-metal contact. It is generally too viscous for most standard hydraulic systems, which typically specify ISO VG 32-68, so you should verify your equipment manufacturer's viscosity recommendation before using this product in a hydraulic circuit.

R&O stands for Rust and Oxidation inhibited. Unlike plain mineral oils, TRUEGARD R&O 320 contains chemical additives specifically designed to prevent corrosion of metal surfaces and resist oil degradation caused by heat and oxygen exposure, which helps extend both oil service life and equipment life.

Superior thermal stability means the oil resists viscosity breakdown and the formation of varnish, sludge, and deposits even at elevated operating temperatures. This keeps the lubrication film consistent throughout the operating cycle, reducing wear on bearings and gears in demanding industrial environments.

TRUEGARD R&O 320 is specifically described as a circulating oil, meaning its formulation is engineered to perform reliably in recirculating oil systems common in industrial machinery. Its oxidation resistance and anti-sludge properties also make it suitable for splash- or bath-lubricated gearboxes and bearing housings.

The product data does not specify compatibility with other lubricants. Industry best practice is to drain and flush the system before introducing a new lubricant to avoid diluting or compromising the additive packages of either oil and to ensure full performance from TRUEGARD R&O 320.

The product data does not list specific storage conditions, but as with most industrial lubricants in drum containers, the drum should be kept in a cool, dry, covered area away from direct heat sources and moisture. Keeping the bung sealed when the drum is not in use prevents water ingress and airborne contamination that could degrade the oil's rust and oxidation inhibitors.