OEM and Mazdaspeed and most other original bushes these days do not need greasing because there are no sliding or rotating compnents. All the give is within the rubber bonded between the inner sleeve and outer control arm housing.
Poly bushes do have a rotating component, between the inner steel sleeve and the bush. They typically need an annual greasing, otherwise they begin to squeak or bind. This is the big trade-off for poly's more precise suspension control and significantly lower price.
Where do you find grease for poly bushes?
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