Lug nuts won't stay tight

[Beaker]

Jack the car up, tighten lug nuts using a star pattern. Lower car, check tightness again. If service used lubricant, claen off lug bolts with degreaser or parts cleaner. If not and lug nuts still get loose again, you can always try a very small amount of loc tite on the bolts. But beware, this may make tire changing difficult.