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Craftsman LT4000 I/C GOLD 6speed 42" ride on mower - $550
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I/C stands for "Industrial/Commercial". This designation was used by Briggs & Stratton to indicate engines that were built with more durable components and features intended for heavy-duty use or longer operating life compared to their standard consumer-grade engines.
The "Gold" part refers to premium features like full-pressure lubrication systems, spin-on oil filters, and cast-iron cylinder sleeves, all of which contribute to engine longevity and performance.
"I/C Gold" on a Sears tractor, it signifies that the engine is a higher-quality, more robust Briggs & Stratton engine designed for tougher tasks and extended use than a typical lawn mower engine.