Synthetic oils

Castrol Syntec or Mobil-1 or Pennzoil Synthetic or Mobil Delvac. Never Scamsoil (overhyped, overpriced), never Redline (probably worth the price but overkill/overspend for anything I will ever own or drive). I run 0w30 in the winter for easy starts and instant oil feed to all the engine's critical parts.