K&N Filter ? - ZR-1 Net Registry Forums

ZWILD1 · 11-03-2018

I ran a K&N in my first 91 Z. The car I bought has one in it. I did a filter clean and recharge using the K&N products. Has anyone had issues with the K&N filter oil cause problems with sensors? I did the filter service several months before Carlisle and it hasn't really been driven a lot of miles. But I now have both 02 sensors showing rich. I remember from my first car seeing the red K&N filter oil making it's way up the intake hose and into the air horn and probably into the intake.

When I pulled the assembly to do the filter service it had some oil in the hose and the air horn. I was reading on another car forum where a guy claimed his mechanic said his Mercedes needed lots of work from the filter oil causing problems like issues with the MAS and then other said it was a problem. So I thought I would ask ZR1 guys if any problems from the oil.

Z51JEFF · 11-03-2018

I’ve got the K&N filter and I don’t oil it after it’s cleaned,I don’t drive in dusty areas so it’s no big deal plus it just makes a huge mess trying to clean it.

32valvZ · 11-03-2018

I have one in my 90. I did the recharge and cleaning... the key is to let it dry 100% and LIGHTLY oil it.... I havent had any issues and I didnt see any oil in the intake tube when I had it off a couple weeks back....Im sure I would have seen it too because I have a smooth, white anti-collapse insert in mine...

Paul Workman · 11-04-2018

I have the K and N setup too; came with the car: bought in '07 and I never had a minute of trouble with it. But, it sounds to me like you're using WAAAY too much oil!

I don't know if that (K&N) oil has anything in it that would affect the O2s, but in any case that K&N kit should last for a couple treatments (at least). IOW, you shouldn't have ANY oil collecting in the accordion bridge hose or in the plenum!

Is the K&N oil contaminating the O2s somehow? I couldn't say. But, you can eliminate the excess oil from the intake and see if that fixes the rich problem (before changing out the O2s).

11-03-2018	#1
ZWILD1 Join Date: Aug 2004 Location: Spring Grove ,Pa. Posts: 258	K&N Filter ? I ran a K&N in my first 91 Z. The car I bought has one in it. I did a filter clean and recharge using the K&N products. Has anyone had issues with the K&N filter oil cause problems with sensors? I did the filter service several months before Carlisle and it hasn't really been driven a lot of miles. But I now have both 02 sensors showing rich. I remember from my first car seeing the red K&N filter oil making it's way up the intake hose and into the air horn and probably into the intake. When I pulled the assembly to do the filter service it had some oil in the hose and the air horn. I was reading on another car forum where a guy claimed his mechanic said his Mercedes needed lots of work from the filter oil causing problems like issues with the MAS and then other said it was a problem. So I thought I would ask ZR1 guys if any problems from the oil. __________________ 91 Turquoise Metallic Haibeck 525 #0134

11-03-2018	#2
Z51JEFF Join Date: Dec 2007 Location: Fremont, CA Posts: 3,093	Re: K&N Filter ? I’ve got the K&N filter and I don’t oil it after it’s cleaned,I don’t drive in dusty areas so it’s no big deal plus it just makes a huge mess trying to clean it.

11-03-2018	#3
32valvZ Join Date: Nov 2007 Location: Sunshine State Posts: 1,061	Re: K&N Filter ? I have one in my 90. I did the recharge and cleaning... the key is to let it dry 100% and LIGHTLY oil it.... I havent had any issues and I didnt see any oil in the intake tube when I had it off a couple weeks back....Im sure I would have seen it too because I have a smooth, white anti-collapse insert in mine...

11-04-2018	#4
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: K&N Filter ? I have the K and N setup too; came with the car: bought in '07 and I never had a minute of trouble with it. But, it sounds to me like you're using WAAAY too much oil! I don't know if that (K&N) oil has anything in it that would affect the O2s, but in any case that K&N kit should last for a couple treatments (at least). IOW, you shouldn't have ANY oil collecting in the accordion bridge hose or in the plenum! Is the K&N oil contaminating the O2s somehow? I couldn't say. But, you can eliminate the excess oil from the intake and see if that fixes the rich problem (before changing out the O2s).