Challenger 65E, Challenger 75E, Challenger 85E and Challenger 95E Agricultural Tractors Caterpillar

Obtain the oil samples as close as possible to the standard intervals. In order to receive the full value from S·O·S oil analysis, you must establish a consistent trend of data. In order to establish a pertinent history of data, perform consistent oil samplings that are evenly spaced.

Table 1

Compartment	Recommended Oil Change Interval	Recommended Sampling Interval	Sampling Valve	Oil Type
Engine	250 Hours	250 Hours	Yes	DEO
Hydraulics	1000 Hours	250 Hours	Yes	HYDO
Transmission	1000 Hours	250 Hours	Yes	TDTO
Differential and Final Drives	1000 Hours	250 Hours	Yes	TDTO

Consult your Caterpillar dealer for complete information and assistance in establishing an S·O·S program for your equipment.

More Frequent S·O·S Sampling Improves Life Cycle Management

Traditionally, the suggested S·O·S sampling intervals have been at each oil change, 250 hours for engines, or every 500 hours for all other compartments. However, when you operate the machine under the following conditions a sampling interval of 250 hours is recommended for all compartments.

Application

Studies show that a 500 hour interval between oil samplings is too long for the timely indication of potential failure modes for some applications. These applications have high loads and high temperatures. A 250 hour sampling interval provides more data between oil change intervals. This increases the potential for detecting a potential failure.

Determining Optimal Oil Change Intervals

Sampling compartments every 250 hours also provides oil condition/performance information to ascertain the optimal utility of a particular oil. Also, more data points enable close monitoring of component wear rates while obtaining maximum lubrication utility. For detailed information on extending oil change intervals, please consult your Caterpillar dealer.

Optimizing Component Life Cycle

An increased sampling frequency also provides better defined data trends from one oil change interval to the next. This enables close monitoring of component life cycle wear patterns to assure full component life cycle is realized.

In summary, the standard S·O·S oil sampling interval for all engines remains at 250 hours. While 500 hour oil sample intervals remain acceptable for non-engine compartments, they are not necessarily optimal. Under the above conditions, 250 hour oil sampling intervals are recommended.