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Good info Eric. I am working in heavy construction and all our equipment is sampled.
It is accurate enough to know if your air filter housing is leaking past the filter. Shows up in high chrome (Rings) and silicate (dirt). Also other problems like those leaking injectors that some of the early 6.0's had as well an numerous other conditions.
It is however a program that must be done on a continous basis. Some of the problems show up only when a certain compound has elevated levels. Some of the small problems are hard to detect in one sample. Sample to Sample analysis should be fairly consistent. You need to be able to compare samples taken over a period. A good test lab is very helpfur at this as the average person would not have any clue what they are looking at.
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