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  1. S

    Group 111 to group 1V oil switch

    I am considering PP or SynPower (111) or Mobil I or Ultra. I generally read that Ultra is GTL (111) but saw a reference on this site to a twitter blog post by a Shell tech that Ultra was PAO (1V) at that point but no specifics were given. So, Ultra is a bit of a mystery (5-30/10-30).
  2. S

    Group 111 to group 1V oil switch

    This is my first post so thanks in advance. . .I recently purchased a very nice 97 3.4 4wd 4Rlunner with 135,000 miles and no oil leaks. Since new, the previous owner used Castrol Syntec. I am considering the use of a different oil and from my reading, I am under the impression that with 135K...
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