Quote:
Originally Posted by eruza
I spent a few hours searching and aside from sending a sample out to Blackstone and proving it's worth myself, I'm going to have to avoid Royal Purple. Call it peer pressure, I suppose lol. I've been too chicken to switch to a yearly oil change with it (or Mobil 1), even though I'm around 5k or less miles per year in the Mach. I've been wanting to try Amsoil anyway, and I'd have to wait for Royal Purple HPS, so now is as good of a time as any.
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I use Amsoil for the added zinc and its ability to hold up when running E85. However, I still change it often, E85 is rough on oil.