I recently bought a G35 sedan and decided that I wanted to install the Z tube with K&N filter. After doing it this past week I have done more research on K&N filters and I am having second thoughts about replacing the OEM air filter.

It is a known fact that these filters are designed to be "high flow" air filters and they definitely do allow more air. With the increase in air flow there is also an increase in the amount of dirt that is allowed into the engine.

Dirt in the engine is pretty much the worst possible thing for it, and while the OEM paper filter doesnt allow the same quantity of air it definitely stops more dirt.

Also, the fact that K&N filters are oiled is also a bad thing as there are many reports of this oil damaging the MAF sensor.

These are two major concerns with using the K&N.

The purpose of creating this thread was to gather everyones opinion on the subject and to see what everyone thinks about K&N filters. Positive and Negative opinions are welcome.

 

I've had mine for about a year now and love it. As far as oiling goes, if you follow the instructions, you should be ok. Never oil and install immediately. Always allow time for teh oil to dry a bit. And don't over oil. As the filter gets dirty, it actually filters better from what I have read. I also could have sworn that the K&N filter finer particles then stock filters, but I can be wrong. I can't speak for everyone, but I have had no issues with it!

 

Another paper filter option:
https://g35driver.com/forums/g35-coupe-v35-2003-07/53806-new-apex-i-filter-installed-finally-love-audio-pics.html

 

I just replace the filter with a new one every 15k. No need to worry about overoiling then. It's so cheap (about the price of a tank of gas).

 

Cheap?? Tank of a gas is like $60 here in Toronto! It's cheaper to get K&N filter and clean it and re-oiled every 10,000 miles. I had it for almost a year and no problem.

 

While opinions vary, I've run K+N products exclusively for 15+ years with no problems besides lower E.T.'s

 

Well, it's about $40 here in Chicago for a tank of gas or a filter. I guess I'm one of the few who doesn't think gas is overpriced. I don't think gas should always remain at the same price, since everything else goes up in price yearly. I'm not dissing reoiling btw.

 

Flow also has to do with the surface area of the filter material, etc. More pleats usually means more surface area. I've used K&N for about 20 years in different vehicles and never had a problem.

Over-oiling is the cause of MAF problems. Some think that if a little is good, more is better.