Our 06 Corolla with about 128k my son using,I used full synthetic 5W-30 what ever on sale/rebated/clearance and oil filter from fram to purolator even AAP,Autozone,O reilly's house brand.Lately using kirkland for 15$ a 5 quart jug that's for 5k run,Engine is fine will outlast the whole car,the problem now is rust .Also regularly check oil level no consumption yet.