Reader question: Why is my Ikea butcher block splitting?
I got smacked down here a couple of weeks ago for disparaging Ikea's cabinetry. Just ask Becky at Eco-Modernism . Hah! I'll admit, everything Ikea sells isn't automatically crap. So even though it's not crap, it's also not a substitute for the premium products Ikea's imitating either. Wood counters that cost $89 are a case in point.
So the answer your question, you need to look up the assurance on the counter you have got and Ikea desires to update it. They can be a little hesitant to accomplish that in case you've attached it to the cabinetry its sitting on, so be prepared to make your case.
If they won't replace it, your crack can be repaired, probably. If it were me, I'd shoot some wood glue into the crack and then get a band clamp and put the squeeze on for a day or so. Then oil that top and keep it oiled. Wood splits when it dries out, so don't let it dry out.
Then I'd think long and hard about what low prices really get you. I love saving a buck as much as anybody, believe me. But you'll end up a happier customer if you start looking for value instead of prices. Sometimes, the value is in a lower-priced product. Sometimes, it's not.