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axle lubricant

  1. B

    Fluid for L/S differential?

    '97 5.0 2WD EB; 238K miles. Working fine, but I am planning to replace the fluid in the differential for the first time. Axle code is D4, which says it is limited slip. Have searched the threads, but am unclear as to the need to add "friction modifier" to "75W149 Mobil1 Synthetic LS"...
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