Why don't you go to a furniture store and grab a leather lounge suite maintenance kit? 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... :)