Is the Jeep 4.0 Inline 6 a Good Engine? All The Answers You Need by Chad Golen March 22, 2026 0 Key Takeaways: The Jeep 4.0 inline-six engine is renowned for its exceptional reliability and longevity, often exceeding 200,000–300,000 miles with basic maintenance. Common issues are well-documented and easily addressed with straightforward repairs or upgrades. Upgrading to a 4.6L stroker crate engine from Golen Engine Service offers a significant boost in torque and power. Ask any … Read More