The best replacement for prolong is zmax.

The best alternatives to prolong are rated as following:
★★★★★  zmax
★★★★★  slick 50
★★★★  extend
★★★  duralube
★★  ps23
★★  metal lube
★  metabond
  dura lube
  slick50

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prolong
zmax
slick 50