That is true about not using Neatsfoot...

But Neatsfoot oil COMPOUND is great for the same purpose....and can be had cheap... Tandy/LeatherFactory regularly puts it on sale in the gallon jug.... it is a much lighter substance than the straight Neatsfoot.... which I once dipped a feather into and placed on a shelf in the leather shop.. it was still wet 6 months later... straight Neatsfoot is used on things like saddles when being made to keep them from drying out as long as possible... but is not to be applied to the outside where clothes might touch it.

If you actually want to lengthen the working life of the type leather used in our automobiles you have to take the upholstery off and oil it from the underside... way more trouble than most people are going to do.. which would be needed at least every five years.... the finish on our upholstery does not allow oils to get to the side where the drying and final demise will be caused from.

Almost all oils when used on a regular basis will darken leather some.... Lexol is about the lightest and darkens the least... but must be applied more often as a result... Neatsfoot oil Compound is next in line for light...

In the interests of full disclosure.... my grandfather had a shoe repair shop, my father is famous in the leathercraft community for patterns and my uncle was president of Tandy a couple of years in the 1970's... then cofounded The Leather Factory ( which recently bought Tandy ) and has been the CEO up until recently...