Add a can or 2 of STP, all it does is thicken the oil. You can save your oil change. In older engines, especially in the summer I run thicker oil, like 15w40 which is the best oil grade on the planet. I've even been know to run 20w50, but never 5w30, way too thin. I had a friend with a touch of blue smoke and it wouldn't pass emmissions, so we tried an engine treatment. I don't remember which one and it passed.
1985 CJ7 - total customization underway, Sublime green and Plum crazy purple, Ford 9", 258 w/ Holley 475
1985,93 CJ7,YJ - L98 TPI Vette motor, Atlas twin stick, Dana 60s front and rear, Arbs, 39.5 Swampers