No need to lube poly MOUNTS like the subframe and diff, at least based on my experience of running them for years in my E36M3. You may need to lube poly BUSHINGS. The poly rear trailing arm bushings in my E36M3 squeaked a little in cold and/or cool/damp weather despite regreasing with marine grease, though I have never had any squeaks from my poly front control arm bushings.
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