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differential oil

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I'm having trouble finding 90 wt hypoid oil for the rear axle. The auto stores seem to carry 70-90 and 75-90 and synthetics. Any suggestions? Mail order costs more than the oil for shipping.
 
I think that any of the ones you listed would be ok. I actually use 85W-140 synthetic for the hot climate I live in. Don't drive the Healey all that much in the winter.
D
 
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