I did a lot of work to moms car this weekend the valve cover was starting to leak so I changed it . Look how good the engine looks. I change the oil every 5,000-7500 she ran Mobil 1 and Mobil super syn and synpower for the first 60,000 now she just uses pyb 5w20 at 5,000 oci she did go 13,000 once on Mobil 1 but usually she changes it close to on time.