none needed...read an article that said that oil additives actually hurt the oil's cooling properties...sure, it makes the oil rise to parts better, but it causes oxygen bubbles in the oil and hurts the oil's performance
Fuel additives are a different story. RedLine or Chevron Techron fuel injector cleaner aren't bad to use every now and then. But, stay away from oil additives. http://www.bobistheoilguy.com is a good place to learn about oils.
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