Bought a Skoda Superb 3 the other week. The steering wheel was in a bad state as per Photos 1 & 2   I spoke to a leather specialist who said most wheels are not great quality leather these day. Also, medication like statins and blood pressure tablet can leech chemicals through the skin and can damage the leather, - Who'd have thought it?   Purchased a refurb kit and some leather filler from Ebay :   https://www.ebay.co.uk/itm/Leather-Vinyl-Steering-Wheel-Restora