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Image via Wikipedia Engine oil sampling and analysis is used to determine the condition of your engine, check for contaminates in the oil and to ensure essential additives are not depleted. Proper sampling procedures include avoiding external contamination and obtaining a sample that provides an accurate representation of your oil's condition. Samples should be taken when the engine is running, whenever possible, or at least after the engine has been warmed up.
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Drop Tube Sampling
- This method requires a plastic tube that is inserted in your engine's dipstick tube, and pushed down into the oil pan. After the tube is inserted, a small hand pump is used to draw the oil up and into the sample container. Since it important to collect a sample from the mid point in the oil pan, you should use a graduated tube or wire to predetermine the proper insertion depth. Samples taken from too deep in the pan will be contaminated with sediments and sludge.
Drain Port Sampling
- Taking an oil sample when draining your engine oil is easy to accomplish. After warming up the engine, place the drain pan below the oil pan and open the oil drain plug. Allow about half of the oil to drain before placing the sample container in the oil stream. As soon as the sample container is full, quickly remove it from the stream so you do not pick up sediment from the bottom of the oil pan. Be careful not contaminate the sample container with dirt and grease on your hands or equipment.
Pressurized Line Sampling
- Pressurized line sampling is the preferred method of obtaining an oil sample, but will entail greater expense and effort. Since most passenger vehicle engines do not have external oil lines, an adapter must be installed between the engine block and the oil filter to provide a means of drawing off oil while the engine is running. On heavy duty vehicles with external oil cooler lines, engine oil samples can be obtained by installing a fitting in the pressure line and drawing off the sample while the engine is running.
Oil Sample Testing
- Taking the oil sample when the engine is running, or after the oil is warmed-up, provides a sample that contains all of the microscopic particles that are suspended in the lubrication system. At the testing lab, the sample will be tested for trace metals that indicate which engine parts may be failing. Other contaminates that may be found are sludge, water and antifreeze. Oil testing may indicate if essential additives are depleted from your oil indicating the need for an immediate oil change.
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Read more: Engine Oil Sampling Procedures | eHow.com http://www.ehow.com/info_12212417_engine-oil-sampling-procedures.html#ixzz1hTgTNMKX
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