For vehicles equipped with direct injection engines, cleaning the intake valves and intake system is essential to maintain optimal performance. Unlike traditional port injection systems, direct injection can lead to carbon buildup on intake valves over time, which may cause reduced efficiency, power loss, or drivability issues. We recommend performing an intake cleaning service every 60,000 miles to remove these deposits and restore your engine’s performance. Regular maintenance like this ensures smoother operation, better fuel economy, and helps prevent costly repairs down the line. No Refunds