51. Why are engine oils low in reduced viscosity at low

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51. Why are engine oils low in reduced viscosity
at low temperatures and high - at high temperatures?

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Questions and problems from the manual:
"Laboratory Workshop on Colloid Chemistry" Nekrasov AP, Veretenchenko BA, Kharkov NTU "KhPI", 2004
"Characteristic properties of disperse systems" Nekrasov AP, Kharkov, 1996
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