BEARING 5W2791 - Caterpillar

Scheduled Oil Sampling (S O S)
S O S is a diagnostic tool used to determine oil performance and equipment wear rates. Caterpillar recommends using S O S at regularly scheduled intervals to monitor the condition and maintenance requirements of your equipment. The S O S program is a series of diagnostic tests which analyze used lubricating oils from the oil wetted compartments of the equipment.
There are several methods used to obtain S O S samples. Sampling methods recommended are in preference order. If one of the first two methods is not feasible, use the drain stream method.
* Use an in-line sampling valve.* Use a sampling gun inserted into the sump.* Use the drain stream method when changing oil.When using the drain stream method to obtain an oil sample, take the sample after some of the oil has drained out and before the final drain oil. The oil at the beginning or end of the drain stream is not mixed well enough to be representative of circulating oil in the compartments and may carry debris that can give false S O S analysis results.
Lubrication Oil Change Intervals
In order to achieve maximum engine lube oil life and to provide optimum protection for the engine components, Caterpillar recommends using S O S to determine the oil change interval. S O S will help determine the proper oil change interval for your engine considering the type of oil, fuel, and operating conditions. The S O S program will determine oil change intervals based on condemning limits established by Caterpillar. Samples should be taken every 250 operating hours throughout the life of the engine.
The S O S program must include Infrared Analysis to determine oil change intervals. If your Dealer does not have Infrared Analysis capabilities, they can make arrangements for the testing or for approved alternate testing. Your Caterpillar Dealer is the best qualified source to interpret oil analysis data for the regulation of your oil change interval.
Lubricant Change Intervals Without S O S
If S O S analysis is not available, the limits in attached chart should be adhered to for oil change intervals for distillate fuel applications.
If oil analysis cannot be used and no other means of analysis is available, the oil change interval for heavy or blended fuel is 500 hours.
Contact your Caterpillar Dealer for additional information.There have been several different charts published that show the required initial oil change based on engine type used and oil sump size. In order to ensure that you are using the correct chart, follow the oil pan capacity and oil change intervals listed below.