GL-5 lubricants contain high levels of extreme-pressure additives to provide protection under boundary lubrication conditions.
Differential gear oil manual#
GL-4 lubricants are often used in syncromesh manual shift on-road and off-road truck transmissions.ĪPI GL-5 – Intended for heavily loaded gear sets with high sliding forces such as hypoid differentials. The following are some of the most common gear lubricant specifications and their intended applications:ĪPI GL-4 – Intended for gear sets with light to heavy load and sliding forces. Substitutions of one type of gear oil for another can sometimes be done, but these substitutions can be tricky and you should use the guidance of a lubrication specialist to help you make the right decision.įor these reasons, it is important for equipment owners, operators and lubrication technicians to identify which specification is recommended by the equipment manufacturer for each machine and each gear set to ensure that the correct lubricant is being used. Most of the time, these specifications are not interchangeable. There are differences in the additive technology used for lubricants for each specification, and just because one type of gear oil works well for one type of gear application, that doesn’t mean it will work well for all.ĭifferent industry associations and different equipment manufacturers issue unique specifications. Axles, differentials, final drives and other gear sets used in mobile equipment applications all require specific lubricants designed for the heavy loads and the sliding and rolling forces associated with the operation of gears.Īll gear lubricants are definitely not the same. Well, yes, they are all gear lubricants, but no, you can’t just use them interchangeably. Is it really necessary to know what each of these specifications means? And can’t you just use any of them in a gear set? They’re all gear oils, right?
Differential gear oil manuals#
You’ve probably seen these gear oil specifications in equipment maintenance and lubrication manuals for years, but do you know what they all mean? All of these letters and numbers can get confusing.
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