I am so surprised that the filters are SO DIRTY for a 1.5 yrs of usage!
I bought a pair of the new one from Infiniti but they are quite expensive... 55$ Canadian dollars...

 

I've always changed all filters after every other 3k mile oil change. And even those were dirty.

 

Your suppose to change them every year buddy.

 

Wow! I would change mine every 10,000-12,000 miles if i still had factory OEM air filters. I suggest you do the same. Lol.

 

LOL. I though it only needs to be changed every 30k or 40k. LOLLLL. Right, i should get them changed more often...

 

Yep mine looked like that when I changed them this weekend.
$12 each from o'reilley auto parts (WiX)

 

I should have got the one you get.. I think they are pretty much the same anyways...

 

wow...you did the opposite of the smart thing when you waited a year and a half to change your filters.

at least the car FINALLY has new filters

 

LOL, right! I was thinking to add a cold air intake... but .... I am afraid that the sound will be too loud @_@"

 

The 2010 G37 Sedan maintenance manual says to replace:

1. Engine air filters every 24 months or 30,000 miles
2. Cabin air filter every 12 months or 15,000 miles

Since I drive 5-6K miles a year, I'm going by "months" for both.

I would be interested in hearing how many miles Norker102 drove in 18 months on those filters.

 

If you're using those crappy paper filters then every 6 months at most

 

I would go with the recommended periodic changes, in the owner's manual. You can still do a visual check every 6 months. By a visual check I mean holding the air filter element up with a light bulb behind it. If you can not plainly see the light through the filter, change the filter.
Different driving conditions and different parts of the country are going to dirty the filters at different rates.
If you just like spending money, change the filter and fluids as often as you want.

 

I believe the OEM filters are lightly oiled.

 

not to thread steal or anything, but...
does anyone know if dry paper filters (like wix or pure ones) are any good?
considering hte oems are slightly oiled
@highspeed: arent all filters made out of paper?

 

Ok...they're still crappy paper filters. Oiled or not

Haha no. K&N filters are definitely not paper, and I'm sure other high quality filters aren't either. Are there good paper filters? Sure. Do the OEM ones fall into that category? Not IMO.