My buddies at the shop here do SWEAR by the synthetic for these big slipNgrips... THey say that there is no doubt about the increase in hard parts life with the full synthetic on high high mileage transmissions...
Most of their work is on trash trucks with a BAZILLION miles on them... THese little 1000s are about 1/3 the diameter for the frictions/steels/torque converters...
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