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Originally Posted by Tomaz
I've never heard of the "no replacement for viscosity" claim. If this is absolutely true, I'll change to a higher viscosity oil. Is there a study that verifies this? I had always imagined there was a trade off as higher viscosity oils flowed slower and put additional stress to the oil pump. Further, I had heard that modern engines were manufactured to tighter tolerances and therefore, needed lower viscosity oils.
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He will explain this very clearly when he reads your post, Tomaz. I believe he has some expert knowledge on the subject. Search some of his earlier posts, he's written about it before- good stuff
JV