Clean and Protect Leather Seats

Hi,

Looking for the best advice / products to keep my leather in great condition. 

I understand that all Porsche Leather is VAT dyed and then top coated. So I assume that any conditioner will just sit on the top and not nourish the leather.

Porsche 928 S4 1989
Leather Colour - Cream

I use this  www.amazon.com/dp/B001TJ3HUG?ref_=ppx_hz...t_b_fed_asin_title_3
along with a soft brush with very good results.