There price of well-loved, gently-used older tractors is climbing fast, at least in the American mid-west.

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Tractors, like cars—electric or otherwise—are becoming more and more reliant on technology and computers, which forces repairs to be done by dealers. And as those changes are phasing out the farmer in the repair process, older tractors are becoming more sought after in the Midwest, according to a report from the Minneapolis Star Tribune newspaper.

Now, when a tractor built in the late 1970s or 1980s goes up for auction, a bidding war tends to ensue, the paper notes. Although a lot has changed in tractors in the past few decades, what really matters to farmers hasn’t. Old tractors have similar horsepower to the tractors built today, and they’re built well enough to last the 15,000 hours a farmer expects from a tractor.