Thread: What causes an oil to lose viscosity
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Old Mar 16, 2005 | 02:41 PM
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Ryan
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Oilman very interesting read, could you do a simliar exlpanation for the "5W-40 etc" numbers

I.e which do you choose.

10w-40 or 20w-50 say they both had very simliar HTHS values

Many thanks

ryan
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