This SOP for industrial engines.  You sample on a regular basis, after a few 
samples you have a baseline and then you just compare each new one to determine 
if there is excessive or unusual wear in a particular area.

Same thing for hydraulic fluids.

Your Cat buddies are watching for changes in the chemical and metal levels in 
the oil to see how the engine is wearing.  They'll also look at the oil 
condition as well.  You can pretty well estimate when you need specific 
services on the engine based on changes in the levels of certain metals.

That's how they'll decide to do valve jobs, replace bearings, etc.  We;re 
talking about engines with thousands of hours on them. too.  This is in lieu of 
using a chronological framework to establish maintenance levels.  Over the long 
term it makes a lot of sense and is the least expensive way to maintain things. 
 It also allows them to anticipate certain maintenance jobs as well.


On Jul 16, 2014, at 7:51 PM, Curt Raymond via Mercedes <> 

> If the idea is to really watch for changes in the engine then ongoing samples 
> are called for but it sounds like thats something you're not interested in.
> Curt


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