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I hear ya, Pete. I used to be an Amsoil dealer. But I never fully grasped the ins and outs of viscosity, etc.
Whatever the case, I'm sticking with 20w50 in the 928.
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1982 Porsche 928, Auto, 4.5
http://i72.photobucket.com/albums/i166/hethaerto/928Mist2.jpg?t=1305333945
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