I have my own feelings about Walmart. In general I just won't shop there, it'* too crowded. But they do have low prices. Back to on-topic,. . .
. . .I had a 1974 Ventura with a Pontiac 350 that would tick like hell and run poorly, if you put 5 quarts of oil in it when you changed it (and yes, that was the correct capacity) but if I drained about 1 quart out, it ran great. I drove it that way for years and years. I mean, obviously there was *something* wrong with it, but if you just drained it down to 4 quarts it ran fine.
Never did figure out what it was, the engine lasted longer than the car did, and I think the car went over 200,000 miles.
It was probably a bad lifter in my old Ventura. You might similarly have a bad lifter, and changing the lubricating qualities of one'* engine seems to affect lifters. So in my very uneducated experience with this, I think it points to a bad lifter in your engine. As long as your synthetic oil keeps it at bay, I don't see any particular reason to do anything else about it, unless you just like wrenching on your engine.
97 SE, teflon wiper blades, Dunlop Sport A-2 tires, Leather steering wheel cover, Pioneer DEH-P480MP mp3 CDRW head unit, Pioneer 12-disc changer, iPod hookup, Boston Acoustic 3 way 6x9'*, Boston acoustic separates in door pods, Alpine 4 channel amp in trunk. Magnaflow dual outlet muffler and Ractive stainless tips. Autozone rice pipe and K&N 4750 intake kit. Clear corner lights. Energy Suspension end links.