The wife's 2007 Kia Sedona (3.8L V6) just turned 210K miles and is starting a small drip underneath the engine on the garage floor , so time to explore a high mileage synthetic (currently rotate between 5W30 M1 , PP , Valvoline) . The vehicle has had synthetic 5W20 / 5W30 after about the 25K mile mark with 6K mile / 6 month OCI's . Here are my thoughts : The M1 5W30 is a "heavy" 5W30 (12.1) but with good cleaning and decent protection . The Valvoline with Max Life is a good high mileage oil but I'm not fond of the high NOACK of 13% . So that leaves me with PP 5W30 High Mileage oil : I'm not sure about the cleaning ability (as compared to M1 and Valvoline) but the sealant should be good as well as the protection and with a low NOACK ... Your thoughts and experiences with PP 5W30 High Mileage synthetic oil ?