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My favorite motor oil is

  • Amsoil

    Votes: 4 4.7%
  • Castrol

    Votes: 16 18.6%
  • Mobil

    Votes: 29 33.7%
  • Pennzoil

    Votes: 15 17.4%
  • Kia brand

    Votes: 4 4.7%
  • Shell

    Votes: 1 1.2%
  • Valvoline

    Votes: 6 7.0%
  • Store brand

    Votes: 2 2.3%
  • Elf

    Votes: 0 0.0%
  • Royal Purple

    Votes: 9 10.5%
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I havent tested it with my SX but i did switch it over at first oil change. How ever when i went to school at UTI (universal technical institute ) in Norwood, MA... in my hot rod 1b class where we had blueprinted 350's earlier in another class my group tested it. We made a base run. Let it cool down. Changed the oil to royal purple, then dynoed again. We saw a 7hp increase under the same conditions (temp, humidity, same rpms etc.. )
Yeah I believe it can yield extra power, but I mean oil analysis in the chemical sense. Like at the end of the change interval how much tin, etc has it picked up. Basically how contaminated the oil is.
 
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