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Originally Posted by 85chedeng300D
Hello Gentlemen! What is the most ideal viscous fan clutch oil viscocity for all weather especially on hot summer days to keep the cooling system at it's most efficient performance? Thanks!
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there's been some experimentation on this very topic. Don't recall where I saw it. Somebody found an oil from Toyota, IIRC, that was appropriate for this application. I'd suggest a search on "viscous fan clutch repair" or perhaps somebody will be able to direct you to the earlier thread.