PU will keep it cleanest. I keep low oci because of GDi and timing chain. Just look for oil with good levels of moly,boron, and HTO 6 spec. Run QSUD 5w30 in high temperature and Pennzoil Platinum or Ultra in winter in 5w30 . My car spec 5w20 but also says 5w30 or 10w30 too. I only run 10w30 two oci when temperature run 100F consistently. Ive added Ceratec so I am content with 5w30 but wouldn't hesitate to at the very least substitute a qt for 10w30 during long hot days. Use a good filter like napa gold or fram ultra too..It helps a lot.