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SOS Fluid Analysis

S.O.S. Fluid Analysis

Allied's scheduled Oil Sampling (S.O.S) program

Developed by Caterpillar for all reciprocating engines, transmissions, final drives and hydraulic systems. S.O.S. is preventive maintenance at its finest. It was developed by people who know engines better than anyone, and who have a vested interest in better performance, longer life and increased customer satisfaction.

No other oil analysis program is as thorough or as reliable at predicting potential trouble early.

Each S.O.S. test provides three specific types of diagnostic tests. 
1 - Wear analysis – monitors machine wear by detecting, identifying and assessing the amount and type of metal wear elements found in used oil.
2 - Chemical and physical tests – detects the physical presence of unwanted fluids (water, fuel, antifreeze) in the oil.
3 - Oil condition analysis – identifies loss of lubricating properties by quantifying combustion byproducts (soot, sulphur, oxidation and nitration products).

Important, when you receive your S.O.S. test results, it is clear, concise and easy to understand. It calls for specific, immediate action and/or makes carefully outlined recommendations – recommendations that add efficiency and productivity.

At all times, your Cat Dealer is available to answer questions or to discuss report specifics in detail, or, when necessary, to all factory technical consultants to help you understand the situation clearly.

S.O.S Expert Analysis

S.O.S. testing is simple and quick. Everything you need is included in a handy, complete kit. Sample testing is done in the Caterpillar dealer’s laboratory by trained technicians utilizing the most modern equipment. These experts know what’s happening inside the equipment.They draw on a large historical database for your equipment to make comparisons and establish meaningful trends. They know speed is crucial, delays can be costly.

Most S.O.S. test results are available within 24 hours after receipt of the sample. If a critical situation is identified, you are immediately notified by telephone. Otherwise, evaluations and recommendations are supplied in an easy-to-understand report. This comprehensive report calls for specific action and / or makes carefully outlined recommendations which, when used, can result in greater efficiency and productivity.

Indication Problem Area & Causes Potential Wear
Soot Excessive Oil Degradation, Thickening Bearing Damage, + / or Piston, Ring, Liner Wear
Oxidation Increase Oil thickening, Varnish, Carbon Piston, Ring, Linear Wear + / or Bearing Damage
Chromium, Molybdenum, Iron Stuck or Broken Piston Ring (s) Ring, Liner Wear
Silicon, Aluminum, Chromium, Iron Dirt Ingestion, Poor air Filtration Piston, Ring, Liner Wear
Silicon, Lead, Aluminum Iron Dirt in Lower Engine Crankshaft Bearing Wear
Copper, Aluminum, Iron Oil Degradation or Contamination Rod eye, Wrist Pin Wear
Aluminum, Chrome, Iron Oil Degradation, Abnormal Operating Temp. Piston, Ring, Liner Wear
Lead, aluminum Oil Degradation or Contamination Crankshaft Bearing Wear
Fuel Oil Contamination, Visc. Loss Bearing Damage + / or Piston, Ring, Liner Wear
Water (NA) + / or Glycol Coolant Lead, Oil Contamination, Sludge Formation   Bearing Damage, + / or Piston, Ring, Liner Wear

Our Part & Service Representative will help you prepare and institute a plan uniquely suited to your operation. He will take into consideration the type of equipment you operate, the kind of work you do, and your current maintenance practices. The largest fleet operator finds Caterpillar S.O.S. a real plus to pinpoint trouble among selected machines critical to his operation, those he can least afford to have shut down for unplanned repairs, or catastrophic failure.


Listen to your oil

Oil contamination and degradation can create conditions leading to excessive wear and eventual engine/ machine failure. Regular S.O.S. identifies and measures these various contaminants and sources of oil breakdown. Early corrective action has saved costly equipment from major breakdowns avoiding downtime and repair costs.

Allied Report Accuracy Rating
SOS Sample Report 


Click here for 
SOS Lab Sample Request Form