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Condensation. The moisture is evaporated out of the oil but that area on top doesnt get enough splash to flush it out. Give it a good wipe with a rag and ride
From: Annemasse (border of Geneva-Switzerland) facing Mt-Blanc.
Originally Posted by HDV-GLIDE
That crap is really good stuff for the tranny but it does smell like crap in the summer.....
That's the price to pay: the smell of Hydrogen Sulfide + Skunk odor (alkyl mercaptans) and more ...
You will find info here in the MSDS under Thermal Decomposition in paragraph 10