Hello gentlemen, and first of all, let me thank everyone for the support and help and advice after my uncles passing. Other uncle; we dont know how much time he has, as brother, and my nephew(new to me nephew) saw him other night back home. Anyways, anyone here use the ST syn in any grade? One of my co workers uses the ST syn in his 97' I believe hatchback GEO METRO without problems. Has over 197k on it, without any issues. I thought bout using it in my 98' silverado with the 4.8 v-8, may just stick with my 6500 oci in both trucks with ST conventional 5w30. Let me know what you guys think, and thank you in advance.