![]() This points to the need for a universally accepted viscosity designation - one that can be used by lubrication practitioners, lubricant suppliers and machinery design engineers simultaneously with minimal confusion. To complicate matters, machinery designers must define the lubricant viscosity in such a way that the equipment user understands clearly what is needed without having to consult outside advice. To the new entrant into the lubrication field, the number of options can be confusing, particularly if the primary lubricant supplier does not associate one of the prominent viscosity systems to the product label. While all of these have served useful purposes to one degree or another, most lubrication practitioners settle on and use one method as a basis for selecting products. To add to the confusion, two measures of temperature (Fahrenheit and Celsius) can be applied to most of these, not to mention that viscosity might be presented at either 40☌ (104☏) or 100☌ (212☏). There are SAE (Society of Automotive Engineers) grades for gear oils and crankcases (engines), AGMA (American Gear Manufacturers Association) grades for gear oils, SUS (Saybolt Universal Seconds), cSt (kinematic viscosity in centistokes), and absolute viscosity. ![]() If your tractor or truck calls for 20W hydraulic oil, it may be best to use the thicker ISO 68 in hot temperatures and thinner ISO 46 in cold weather.Through the years, lubricant users have been treated to a number of ways to designate viscosity grades of the lubricants used in manufacturing. This is because the ISO specifications are broad, and they overlap with SAE weights in some cases. You may notice that ISO 46 can replace both 15W and 20W SAE oils. Only use this chart to find an oil equivalent to the manufacturer’s recommended oil for your tractor or truck. It’s important to get the right hydraulic oil for your tractor or truck to make sure that the hydraulics work well and last for a long time. However, even if it is extremely hot, you should not use a thicker oil. In very cold weather, you may want to use a thinner hydraulic oil, because the cold thickens your oil. Oil in extreme temperaturesĭepending on the temperature you run your engine in, you may want to use a slightly thicker or thinner oil. This oil conversion chart is approximate. This ensures that one brand's 30-weight oil is the same viscosity as another's. ISO and SAE are standardized specifications that define oil weight. If you bought a tractor and need to change the oil or hydraulic fluid, and you’re not sure which weight to buy, here is a helpful oil conversion chart that may make things easier. This would not be a problem if hydraulic oils weren’t labeled using the ISO system now, but they are. Often, the hydraulic oil for an older tractor is listed using an SAE oil weight. Also, oil has changed since the old days, and the way manufacturers list the recommended oil is sometimes different from the way oils are labeled now. Owner’s manuals are important because they include the tractor’s specifications, replacement parts, and which oil it requires. ![]() Vintage tractors and tillage equipment are usually bought at auctions, so collectors don’t always have access to their owner’s manuals.
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