posted on Oct, 27 2015 @ 02:45 AM
Reciprocating internal combustion engines, like in a car, become quickly worn when there is a source of dirt being ingested by the air intake. Often,
there's a leak around the air filter, or a gauze "performance" filter has been substituted, which allows big dirt particles to pass, unlike a paper
filter. Another source is when guys try to clean the old filter with compressed air, usually in sandy areas.
When a used oil (lab) analysis is done, the dirt shows up as silicon in the spectral analysis. When the si spikes, you see wear metals from the engine
also go thru the roof. Different metals correspond to different parts in the engine, notably upper cyl (bore) wear of al or fe, and the rings, in the
form of excess tin and chrome dissolved in the old oil. Getting to the point, wear rate can be 20-30x faster than clean engines. So, in one oil change
you can put 100k worth of wear on an engine, in extreme cases.
Just wanted to give an informative analogy on something interesting and put a number to the "sand" thing. It's quite real and if anyone wants to see
some wild lab work from the spectral analysis of these used oil samples I refer to, I'll dig them out.
Used Oil Analysis is commonly used in heavy industry, military apps, aircraft maintenance, OTR trucking and other HD diesel engines like heavy
equipment, locomotives or stationary engines like generators and to a smaller extent passenger auto engines. I use Caterpillar Labs for my UOAs, like
$15 if you drop off your own....Blackstone is the most common.
Now many of us learned something new! (don't monkey w/your airfilters until they are due, like 30k miles minimum, paper filters don't clog, they
filter BETTER over time)
edit on 27-10-2015 by FlyingFox because: freedom