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  • #16
    A note of caution! It has been generally stated that 20W50 oil does not have reduced levels of ZDDP. A current properties listing for Valvoline 20W50 conventional oil shows a reduced level of Zn, same as the lighter weight oils. As previously pointed out, their ATV and motorcycle 10W40 still has the higher levels desired for flat tappet engines. This information is on their website under "properties" by grade.

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    • #17
      More info at http://systems-engineering-associates.com/avocation some articles.[)]
      and yes! you can have too much ZDDP!


      Terry, North Texas
      1963 Avanti R2, 63SR1065
      (in stage 1 resto "Project A")
      http://sterkel.org/avanti
      1985 Kubota L2202(Diesel)
      1999 Toyota rice burner
      1986 Ford 150 Long Bed

      New resolution.
      I will continue to respond, to the best of my ability, to any query,
      challenge or alternative view relevant to my original post.
      I will not respond to anything off (the original) topic...

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