I think and key word THINK. I am no expert in anything realy  But i think alot of people try to run the lightest oil because they are taught that thinner oil is easer to pump therfore is less drag on the motor and therefore more hp. Obviously thats a hole artical just summed up in a few short words. But you get the idea. Maybe its beieved that thinner oil will protect better because it can find its way into tighter tolerances,  Def. a good thread so lets keep it alive 
98 csvt t-red.. sho-shop intake, b&m, fidanza, spec1 clutch, Torsen, DMD,optimized Y& TB, Brullen, rear strut bar,h&r's,17" konig traffik's.
"I say what I mean and I do what i say"
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