I-4 engine plugs are really easy to access, so changing them is just a 15-20 minute task. Just one of the many advantages of a 4cyl, now if they would just locate the oil filter up front.....
Silver Bullit...the original NGK plats are very long lived, I replaced mine at 102K and at that time the plug gap was still in spec and the plug condition was perfect. If you're not experiencing drivability issues or mpg concerns, you may not need to replace them. How many miles on your vehicle?
Maybe just pull one or two and check the gap and condition, then if all is good, pop them back in, unless they're already at very high mileages. I still have my originals in my emergency parts kit.
2009 Hyundai Elantra Touring (I30cw)
@10 miles when it left the lot...@21K+ now.
'01 2.3L LX Sedan @217K+ miles... Original owner,
handed off to my son.
Had 6th Genititus, on 2nd trans @112K