I had and older civic never burned oil at 100,000 miles using 10/40 but I tried Walmarts syntech brand, sounds smooth same good mileage but I changed the oil before a 1000 mile round trip to Los Angeles through desert heats in summer. After tmrerurning the cam & rockers tick tuckity tick, I thought perhaps possibly an enternal issue . Changed oil again same brand. Made a second same trip. Same issue again after the trip . Locally grocery getting the oil wa fine but would breakdown on those king hot trips, (zero overheating issues) NEVER WILL I BUY DISCOUNT STORE BRAND OIL AGAIN ! It’s not worth that $3-$5 savings to end up wiping/wearing out your engine prematurely trying to save a buck or two,