2013 BMW 335i engine replacement is a major repair most commonly triggered by N55 turbocharged engine failures due to oil system issues, timing chain wear, or turbocharger damage. The 2013 BMW 335i is equipped with the N55 single-turbo 3.0L inline-6 engine, and replacement costs typically range from $5,000 to $11,000 depending on whether a used, remanufactured, or OEM engine is sourced. Labor costs alone can reach $2,000 to $3,500 at a certified BMW specialist. Before proceeding with a 2013 BMW 335i engine replacement, verify whether any existing extended warranty or previous recall coverage applies. Always request compression and leak-down test results when purchasing a replacement unit. For quality used and remanufactured engines, Moon Auto Parts is a trusted supplier worth considering.