High Performance

Castrol Molub-Alloy OG 936 SF Heavy

Castrol Molub-Alloy OG 936 Open Gear Grease


Castrol Molub-Alloy OG 936 is suitable for use with open gears, gearing, and sliding surfaces operating in harsh environments. The propellant is propane/butane For the lubrication of open gears in severe service and/or harsh environments.

  • Solvent-free
  • Outstanding load-carrying capabilities
  • Provides a tough, durable lubricant film on contact surfaces

Castrol Molub-Alloy 936 SF open-gear compounds are open-gear lubricants developed specifically for use on heavy-duty equipment in mining and industrial service. They are compounded to give maximum protection to gears and slides on large draglines and shovels while minimizing the release of potential pollutants to the environment.

A highly refined, viscous, paraffinic petroleum derivative is the foundation of a blended base fluid with excellent natural chemical and thermal stability. Molub-Alloy 936 SF open gear compounds are designed to flow readily to form a durable lubricant film, yet resist squeeze-out and cling tenaciously to gear teeth.


Castrol Molub-Alloy OG 936 SF Heavy is suitable for use on all types of open gears, racks and pinions and sliding or skidding applications such as draglines and shovels. It can be applied either manually or by heavy-duty automatic systems.

This product is used extensively in mining, construction, onshore drilling operations and offshore installations, facilitating effective lubrication and protection on:

  • Rack and pinion jacking mechanisms
  • Cantilever skidding systems
  • Mooring winch open gearing and slides
  • FPSO offloading systems
  • Crane slew ring & pinion
  • Exposed threads on penstock valves
  • Heavy-duty top dressing for the ultimate protection of wire ropes

Molub-Alloy OG 936 SF Heavy complies with the Bucyrus International SD 4713 specification (CAT) and Komatsu specifications for Open Gear Lubricants

  • Formulated to address environmental concerns – it is free of solvents, lead, antimony and Barium.
  • Forms a tough durable film with a “cushioning” effect, even under extreme pressures and at very slow speeds.
  • The film resists erosion from rain or sleet and resists peeling in dusty environments.
  • The film resists destruction by contaminating oils and greases migrating from nearby mechanisms.
Operating temperatureMin. -10°C
Max. 80°C
Oil typeMineral
Food gradeNo
Product typeGreases
Applicable to these sectorsAutomotive Manufacture, Machinery, Metals, Mining, Power Generation, Pulp & Paper

All packages should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and damage to drum markings. Products should not be stored above 60°C, or exposed to hot sun or freezing conditions.

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Product Data Sheet 

Safety Data Sheet

Castrol Molub Alloy OG 936 SF Heavy High Performance Lubricant Oil
12 x 400ml Spray

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