Yugo L4-1300cc 1.3L (1991)
An excellent "bench mark of the overall quality of a fluid is its viscosity at -40 degrees. This is measured in "centipoise" or "cPs". DEXRON II
specification says viscosity will be no more then 50,000 cPs @ - 40 degrees. (Some poor fluids have tested at over 1,000,000 cPs) In general, the lower
the number, the better the fluid.
Keep in mind that as the number goes down the price of the fluid usually goes up. (You get what you pay for) Most good fluids will average around
35,000 cPs. Hydrotreated (or Hydrocracked) fluids average around 20,000 cPs or less. (Hydrotreating is a refining process done to the base oil to clean
out contaminants or impurities) Synthetic ATF's average 10,000 cPs or less, and some are as low as 5000 cPs. Viscosity at -40 degrees is a function of
the base stock from which the ATF is made. A low number indicates a premium base oil OR an expensive refining process. (Hydrotreating)
FOR ADDITIONAL INFORMATION:
Transmission Digest August '89
Page 91 December '89 Page 51
BULLETIN RECAP
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Only use fluids with O.E.M. approvals.
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Try to get a fluid that meets more than one spec (e.g DEXRON II AND MERCON)
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Check the viscosity at -40 degrees. The lower the number the better.
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Avoid bargain basement fluids with no license numbers.
