This depends on the wood type and your log splitter size. A 10-ton log splitter can split almost any kind of 6-inch log. A 22-ton log splitter can split any kind of 12-inch log. A 30-ton log splitter can split any kind of 24-inch log. If you intend to split a log larger than 24 inches, you may want to consider preparing it first with a splitting axe and wedges.