PISTON 5I7793 - Caterpillar

The proper oil viscosity grade is determined by the minimum ambient temperature at engine start-up and during operation. In order to determine the proper oil viscosity grade, refer to the "Min" column and the "Max" column in the table. The "Min" column indicates the coldest ambient temperature condition for starting a cold machine and for operating a cold machine. The "Max" column indicates the oil viscosity grade for operating the machine at the highest ambient temperature that is anticipated. Use the highest oil viscosity grade that is allowed for the ambient temperature at engine start-up and during operation.Operation of the transmission with an oil viscosity grade that is too high can cause damage to the friction disc. Operation of the transmission with an oil temperature that is too low can cause damage to the friction disc. Also, damage to the friction disc can be caused by extended shift time and a slow rise in clutch pressure. Thicker oil does not provide the correct amount of oil flow in some areas and thicker oil can reduce the lube flow in some areas.For vehicle operation in the ambient temperature range of 10 to 50 °C (50 to 122 °F),MTO 10W30 is the recommended viscosity.
If the ambient temperature at engine start-up or during operation is below -10°C (14°F), perform the procedures in Operation and Maintenance Manual, "Machine Warm-Up". Check the transmission for the proper fluid level. Failure to warm-up the oil or improper lubrication levels prior to operation will cause damage to the transmission.
Caterpillar MTO 10W30 is balanced in order to provide maximum friction material life in the following components: power shift transmissions and torque converters. MTO 10W30 has passed the requirements for the MTO 10W30 oil specification. The MTO 10W30 oil specification includes frictional requirements and gear wear requirements.Caterpillar only recommends Caterpillar MTO 10W30 oil. This oil provides the maximum performance and the maximum protection for Caterpillar transmissions.Note: Multigrade oils must meet the requirements of Caterpillar MTO 10W30 for use in transmissions. Multigrade oils that use high molecular weight polymers as viscosity index improvers may lose the viscosity effectiveness because of temporary shear and permanent shear of the polymer viscosity index improver. These types of multigrade oils are not recommended for Caterpillar transmissions. The Caterpillar MTO 10W30 oil requirement includes a test for the shear stability of multigrade oil. If Caterpillar MTO 10W30 is not available, use commercial oils that comply with Caterpillar MTO 10W30 oil specifications.Note: Refer to Operation and Maintenance Manual, SEBU5898, "Cold Weather Recommendations" for the selection of oil when the machine is operated below −20 °C (−4 °F).