I've been using Zaino's Leather in a Bottle for a few years, and I like it. They sell a cleaner and a conditioner. I apply the conditioner with my bare hand. It's basically like lotion. It is THE best smelling product I've ever used for leather. It makes the leather smell like a brand new leather jacket.
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2005 BMW 330Ci ZHP Jet Black/Black with aluminum cube
Bone stock at the moment
Id go with something that is more of a cream than a spray. you might need to leave it on a bit longer, but not what you'd need to with leatherique.
Any thoughts on restoring / preventing further degradation for a little bit of cracking on the bolster?
It's going to happen over time anyway, but the best thing you can do is to make sure the leather stays nice and hydrated. If it's cardboard hard, there's no saving that, but if it's still nice and soft to the touch, then you can continue to hydrate it to keep it as nice as possible.
If you're not sure what the leather is supposed to feel like, go to the back seat (if you have a sedan) and fold down the center armrest and get a feel for that leather. That is usually as nice as it gets.
This might sound kind of out there, but I'm trying black boot polish (Kiwi). It's what I know, and it definitely works, but you might want to avoid sitting in them with white pants.
Kiwi Heel & Edge or Honor Guard Edge Dressing are more durable and less likely to rub off on your clothes.
2006 330ci ZHP - Silbergrau Metallic / Stoff Laser/Anthrazit / Alu Black Cube trim / Adaptive Xenon headlights / HK hi-fi system / heated front seats