Oil analysis for diesel commercial vehicles is performed after failure to measure engine wear and contamination. Oil analysis conducted for off-road Mobile fleets is extensive. However, many large on-highway fleet operators change oil at predetermined intervals and don’t conduct oil analysis, although this trend is changing. Significant savings can be achieved by extending drain intervals on a large fleet. The following example is a program developed by a major lubricant supplier and illustrates the magnitude of the savings they experienced:
A small over-the-road fleet operator with 150 trucks decided to increase oil life by upgrading the lubricant and monitoring the lubricant’s condition through oil analysis. Samples were taken every 3,000 to 4,000 miles (4,800 - 6,400 km) until a reliable drain interval was established. Oil analysis was performed at the new drain intervals to determine wear metals and oil condition. Drain intervals were extended from 20,000 to 36,000 miles (32,000 - 58,000 km), resulting in savings of $28,000 per year.
In the next few years, major changes in emission standards will occur. New generation oils will be required to meet the stringent PC-9 requirements to be introduced in 2002. Retarded timing and exhaust gas recirculation will result in much higher soot loading in the oil, some predict as much as 10 percent. Also, higher BN will be required because of the acidic exhaust gas being recycled back into the engine to be burned. Higher temperatures will require better oxidation control in the oil. This will significantly change diesel engine oil formulations along with the condemning limits. The following limits are based on current engine requirements.
Condemning Limits for Diesel Engine Oils
These are general guidelines. Check with the OEM for specific guidelines. Viscosity change and coolant contamination are major reasons for condemning oil.
any engine oil
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