The best replacement for redline is amsoil.

The best alternatives to redline are rated as following:
★★★★★  amsoil
★★★★★  royal purple
★★★  blackline
★★  9500ix
★★  meltdown
★★  v1
★★  mobil 1
★  haro
★  valentine one
★  motul
★  amsoil gear oil
★  max
★  redlined
★  cobalt ss
★  red line
★  techron
★  redline xtreme
★  5 hour energy
★  passport max
  valentine 1
  redbull
  lipo 6
  mobile 1
  x50
  seafoam
  royal purple oil
  sti magnum
  sti driver
  9500
  passport 9500ix
  mobil1

Your alternative for redline is not listed? Suggest!
Speaking about redline, one probably shouldn't forget about escort live.

Other search terms related to redline and their ratings are:
★★★★★ escort live
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Google Trends

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redline
amsoil
royal purple