One of the biggest benefits of synthetic anything is how it performs in the cold climates....around here a car with synthetic engine and transmission oils is much happier when its 0F outside.

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Is that due to viscosity?

In hot climates...there shouldn't be as good of a need though right?
I need to change my wagons as I just hit 30k miles last week....

Trying to debate between Synthetic or Dex III....Mainly because the front seal is leaking a little....I don't want a little to turn into a lot.

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