CYLINDER GP-HYDRAULIC 1383123 - Caterpillar

In selecting oil for any engine application, both the oil viscosity and oil performance category/specification as specified by the engine manufacturer must be defined and satisfied. Using only one of these parameters will not sufficiently define oil for an engine application.
Lubricant Viscosities
The proper SAE viscosity grade of oil is determined by the minimum ambient temperature during cold engine start-up and the maximum ambient temperature during engine operation. To determine the oil viscosity that is required for starting a cold engine, refer to the minimum temperature in Table 1. To select the oil viscosity for operation at the highest anticipated ambient temperature, refer to the maximum temperature in Table 1. Generally, use the highest oil viscosity that is available in order to meet the required temperature during start-up.
Table 1
Engine Oil Viscosities for Ambient Temperatures    
    Ambient Temperature    
Viscosity Grade     Minimum     Maximum    
SAE 0W-20    
−40 °C (−40 °F)    
10 °C (50 °F)    
SAE 0W-30    
−40 °C (−40 °F)    
30 °C (86 °F)    
SAE 0W-40    
−40 °C (−40 °F)    
40 °C (104 °F)    
SAE 5W-30    
−30 °C (−22 °F)    
30 °C (86 °F)    
SAE 5W-40    
−30 °C (−22 °F)    
50 °C (122 °F)    
SAE 10W-30    
−18 °C (0 °F)    
40 °C (104 °F)    
SAE 10W-40    
−18 °C (0 °F)    
50 °C (122 °F)    
SAE 15W-40    
−9.5 °C (15 °F)    
50 °C (122 °F)    S O S Services Oil Analysis
These recommendations are subject to change without prior notice. Contact your local Caterpillar dealer for the most up to date recommendations.
Caterpillar has developed a maintenance tool that evaluates oil degradation. The maintenance management also detects the early signs of wear on internal components. The Caterpillar tool for oil analysis is called S O S oil analysis and the tool is part of the S O S Services program. S O S oil analysis divides oil analysis into four categories:
Component wear rate
Oil condition
Oil contamination
Identification of oilThese four types of analysis are used to monitor the condition of your equipment. The four types of analysis will also help you identify potential problems. A properly administered S O S oil analysis program will reduce repair costs and the program will lessen the impact of downtime.The S O S oil analysis program uses a wide range of tests to determine the condition of the oil and the condition of the lubricated compartment. Exceeding one or more of these guidelines could indicate serious fluid degradation or a pending component failure. A trained person at your Caterpillar dealership should make the final analysis.
Always use a designated pump for oil sampling, and use a separate designated pump for coolant sampling. Using the same pump for both types of samples may contaminate the samples that are being drawn. This contaminate may cause a false analysis and an incorrect interpretation that could lead to concerns by both dealers and customers.
Refer to Special Publication,