Castrol Syntec 0W30 is actually a pretty thick oil despite it's rated viscosity. I think I have a chart saved on my computer that shows the actual viscosity of many different brands and weights of oil, I'll look for it when I get home. People who have run the German Castrol in LS1s and had it analyzed have had very good results. If you want more in depth info on oil check out bobistheoilguy.com
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