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break in

  1. stamina

    what break in oil/standard oil combo would you use for a 4.0

    new piston rings are going to be installed here soon as well as some other bottom end things, what break in oil would you guys use for this?
  2. New motor need opinions on break in oil

    The title says it all. I'm rebuilding a 3.0l for my truck cause mine decided to take a dump. I've bought a re-ring kit from sealed power off summit racing along with new motorcraft spark plugs and new oil. the guys at autozone told me to just add an additive of zinc. Tell me what you guys think.

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