Originally Posted by sarguy01

Where are these reports? Do you have a link?

I want to see the oil analysis on a truck that used a K&N compared to a truck that did not use a K&N. The engines need to have the same miles, be the same type, etc. What I am saying is that I want to see a real experiment with the only variable being the filters.

What were the driving conditions of the truck tested? Was it in a sandy area or was it a city, suburbs, etc?

Bearings wear out over time anyway. Another question I have is how does an increase in dirt in the intake, intake manifold, and combustion chamber end up in the oil? I understand there is blow by, but an increase that causes bearing to fail means dirt is getting in the crank case.

Originally Posted by oldjeep

And to me it's somewhat revealing that when K&N does their testing that they do not do fine dust testing on gasoline engine filters. My suspicious side says that if they performed acceptably with the fine dust that they would use those results.

http://www.knfilters.com/efficiency_testing.htm

Under the parameters of the ISO test, the user may select the grade of test dust used. The content of the two most commonly used types of ISO test dust for air filters are as follows:


As has become customary in the automotive industry, we use Coarse Test Dust for gasoline engine air filters and Fine Test Dust for diesel engine air filters. This practice of using different grades of test dust developed because Diesel engines require higher levels of filtration because they operate at much higher compression and require finer tolerances than Gasoline engines.

Originally Posted by johndeerrm

May want to take a look at this before wasting money on an aftermarket filter setup.
http://www.duramax-diesel.com/spicer/index.htm

Originally Posted by BubbaRadioNetwork

A GM test and the GM filter won. Who would have guessed that? Like someone said before, tests can be manipulated to get the results they want. I'm sure if K&N did the test, they would win.

Originally Posted by johndeerrm

Here you go, High silica and bearing metals. Truck has 26K on it.
http://www.dieselplace.com/forum/sho...d.php?t=311714

High Silica from a cracked intake resonator. Same type of result.
http://www.dieselplace.com/forum/sho...d.php?t=209518


Obviously trucks with oem filters arent getting those results.

Originally Posted by oldjeep

I don't think you read it. GM didn't have anything to do with the test

This report presents the results of an ISO 5011 test of several air filters designed for the GM Duramax Diesel. The test was independently performed under controlled conditions using a $285,000 machine at Testand Corp of Rhode Island (manufacturer of the machine). Arlen Spicer, a GM Duramax Diesel owner/enthusiast organized the test. Ken an employee of Testand offered to perform the tests at no charge.

Originally Posted by sarguy01

Is it so obvious? Where is an oil analysis of a truck with a paper filter? I created an account to look at the analysis.



This is not proof though. It says maybe and probably. What if this guy has a crack in his resonator too?

I am still not a believer that the K&N is going to destroy my engine. I am going to keep using mine.

Originally Posted by sarguy01

Another two things to note.

1. This guy had the oil in his truck for 2 years. That is a very long time.

2. These are diesels, not gas. Gas motors are built very differently.

Originally Posted by oldjeep

Did you happen to look and see who Stowes customers are? Might want to take a look
http://www.stoweenterprises.com/project.htm

The serious race guys use dynos like that, and there are several of them near me.