I use Maxlife 5w30 in both my kids cars- a Cobalt SS & a Mustang V6 Coupe.
Both of our other cars spec 5W-20 so my F-150 gets either Motorcraft syn blend or Valvoline conventional, & the wife's Mustang GT gets Motorcraft syn blend. Figure I'll stay with 5W-20 till the warranties are done then switch to 5w30 Maxlife in these as well, unless 5W-20 Maxlife comes available in my area...