Bearing and Gear Oil

WYROL BG Series are high performance synthetic low staining bearing and gear oils designed for use in rolling mills. Due to their low staining tendency, they are particularly suitable for use in non-ferrous rolling mill applications. They are formulated with low staining synthetic ingredients that ensure adequate lubrication is provided for heavy-duty bearing and gear unit conditions. Their low staining characteristics ensure that the quality of rolled metal is not impaired through leakage into roll coolant systems. This will ensure an optimum life and quality is obtained from the roll coolant; this reduces maintenance and overall costs. WYROL BG oils have good anti-wear and load-carrying performance and protect heavily loaded gears and bearings from damage and wear. WYROL BG oils also exhibit excellent oxidation stability and corrosion prevention properties.

Features and Benefits

WYROL BG oils are specifically designed to overcome the problems generated when conventional bearing lubricating oils contaminate the roll oils and result in finished product staining. They also provide excellent lubrication characteristics to reduce wear and improve equipment service life. Their excellent chemical stability allows extended service intervals and reduced maintenance costs.

WYROL BG oils offer the following benefits:

  • Very low staining properties improve the production of acceptable materials
  • Lower scrapage rates
  • Improved roll coolant life and lower maintenance costs
  • Good anti-wear and load-carrying characteristics increase bearing and gear life
  • High oxidation stability increases oil service life


WYROL BG oils are incompatible with conventional mineral oils and changeover to these fluids require thorough flushing and cleaning before adding WYROL BG oils. Consult your local Marketing Technical Representative for advise concerning changeover procedures.

  • Bearing and gear lubrication in aluminium rolling mill applications
  • They are suitable for splash and mist lubrication systems

Typical Properties

Wyrol BG 220 320 460
Density at 15ºC, kg/m3, ASTM D 4052 1007 1007 1007
Kinematic Viscosity at 40ºC, mm2/s, ISO 3104 235 320 480
Kinematic Viscosity at 100ºC, mm²/s, ISO 3104 32 45 63
Pour Point, ºC, ISO 3016 -30 -30 -27
Flash Point, COC, ºC, ISO 2592 275 275 275
Copper Corrosion, 3h, 100ºC, rating, ISO 2160 1 1 1
Rust Prevention, distilled water, ISO 7120 Pass Pass Pass

Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS’s are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.


It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.