They contain up to 4.0% effective anti-scuffing additives. Oils for various conditions - light to heavy. Designed for lubricating bevel and other gears of truck transmissions.
Recommended for proper lubrication of tractor and farming machine transmissions. They contain anti-wear additives and are designed for worm gears. API GL-1 oils contain no EP addives, are designed for spiral-bevel, worm gears and manual transmissions with synchronizers, in trucks and farming machines. Sometimes they contain small amounts of antioxidizing additives, corrosion inhibitors, depressants and antifoam additives. They consist of base oils without additives. Multigrade gear oils are becoming more common while gear oil does not reach the temperatures of motor oil, it does warm up appreciably as the car is driven, due mostly to shear friction (with a small amount of heat conduction through the bellhousing from the engine block).įully synthetic gear oils are also used in many vehicles, and have a greater resistance to shear breakdown than mineral oils.ĪPI classification subdivides all transmission oils into 6 classes: For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil. It is important that purchasers check the oil against the vehicle manufacturer's specification to ensure it does not contain any aggressive chemicals that may attack yellow metal gear components, such as phosphor bronze.ĪPI viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, most modern gearboxes require a GL-4 oil, and separate differentials (where fitted) require a GL-5 oil. Gear oils are classified by the American Petroleum Institute using GL ratings. Thin oil shouldn't affect starting but may find the odd leak. Thick oil may leak less but in cold temps may cause starting problems. Gearbox oil is specifically designed for gearbox/overdrive applications and contain no surprises.ĪTF - Auto Transmission Fluid appears to work well but may be thin and find leak paths
Single grade engine oils may be more stable (but may aerate) Castrol XXL works wellĭiff oil may work but be carful that it is not a GL5 spec.ĮP oils may work but Laycock warned against this in the early day and have not rescinded this warning. Multigrade engine oils (20/50 etc) may aerate but are widely used Within this group almost anything can be used but all oils have their limits. See below for the explanation of the various oil categories - GL1 to GL6 - with their uses.įor our gearboxes and overdrives a GL4 type oil is recommended.
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