Absolutely as stated above. Oiled filters are a gimmick that allows a grimy build up inside the intake and on sensors. Take a good look at how the air flows through your factory air box and you will see its cold air intake.
What can help a bit, though, is to completely cover the air box and air tube with foil backed bubble wrap insulation to keep the intake temp as low as possible.
74 CJ5, 258, T14a/D20, D30/D44@3.73
12 Cherokee 4x4,3.7L,4RLE/MP1522,D30M/8.25"@3.73,215/85R16 mich LTX A/T2
"Non Vi Sed, Arte"