K&N air Filters

I concur,
Tried one and went back to paper due to dust.

Cheers

Turbo diesel motors need paper filters. Just a small piece of foam filter material hitting the turbo blades is enough th bleep ter one. Fact from Mitsubishi. Be warned.

No worries. K&N don't use foam, but cotton or some other textile sandwiched between metal mesh.

However, K&N's are rock catchers only. The fine stuff still gets through and you can see the evidence downstream of the filter in your intake duct/s.

Speaking from personal experience.

>They are not good for your engine, will let fine particles through.

That is interesting that you say. I am in no way doubting your statement, however I know a few years ago (in WA atleast, cant comment on other areas) that holden used to have oil based filters (finer filter from memory) as a option for vehicles being used in farming areas to avoid engines becoming dusted out. Go figure???

I agree about being used in conjunction with air flow meters, too much oil and your looking for problems. Also some vehicles (such as the jackeroo) have computer issues when they are fitted initially- probably related to the change in air flow. Requires the computer to be reset so it can recalibrate itself.

I myself use one Finer filter brand) in my rodeo and have had no problems thus far. Mind you it is regularly cleaned etc, especially in dusty areas.

this has been discussed at some length before on this and other forums.
Do a search as there is a website that scientifically tested the different types of filters and the results were very alarming for the foam filters.
Basically you have to look at what you are using the engine for, competition engines are rebuilt at the worst after every seson so they don't care about excessive wear. If you intend to keep the vehicle for any length of time then don't use them.
I did run a Unifilter with my previous vehicle a 1hz powered troopy for the whole time I owned it about ten years. It had done 170k approx when sold and it did like to use oil, typically about a litre a 1,000k at cruising speeds which I thought was getting a bit excessive for the mileage. Was the consumption caused by wear from small particles getting through the filter, probably as every time I looked in the intake to the manifold there was always a fine film of dust in there. In the Humvee I run a paper filter and it is always clean as a whistle despite deep bulldust conditions.
Personally I wouldn't run an oiled foam filter in a vehicle I was keeping long term.

Here is a link to one of the independant filter tests
The conclusion was that the standard OEM elements do a pretty good job.
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