They all sell them, and then you're at least using a product specifically designed for leather 'buffing and polishing'. In my experience, most scuffs, even scratches effectively 'disappear' when the leather is 're-moisturised' - for want of a better word.
Or, check the yellow pages for a nearby manufacturer or furniture repairer, drop by in your car and ask them if they've got a small amount of something appropriate that you/they could just apply on the spot. (Sorry, unintentional pun... :).
Maybe you could try some shoe polisher from the store I would try it in a hidden spot first.
If the leather just has surface scratches, you can try olive oil or skin moisturizer. Hair conditioner may also work. You'll probably want to test those in an inconspicuous area first.
If the leather has been exposed to the sun, it may restore color to that section of the leather. If that happens, you may have to do the entire seat to prevent the appearance of a random 'dark spot' on your chair.
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