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The Cat C15, C15, and 3406 engines were Cat's most popular and powerful truck engine for several years. These dependable powerplants had very few problems and could make it well past the 1 million mile mark before a rebuild. This video describes the model year differences, common problems, and maintenance intervals for this prolific Cat diesel engine. @AdeptApe on Venmo or [email protected] on PayPal for donations, thank you so much for supporting the channel!