Recommendations on Leather conditioning products?

[Randy S Whitney <rsw@xxxxxx>]

I have a 1994 540i whose leather seats have seen better days.  Although
they are in relatively good shape from a scratch/crack perspective, the
leather in certain areas, most notably those exposed to the sun has
become nearly as stiff and inflexible as a dashboard.  Can someone give
me a recommendation for any product that can bring some softness back to
those areas?

TIA,
Randy.

------------------------------