What is Reddit's opinion of By Rolf Hilmes Kampfpanzer heute und morgen [Hardcover]?
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I read this wonderful German book about the development of the Leopard 2: https://www.amazon.com/dp/B00SB5LXP2/

I cannot look up the quote, because I don't have the book where I am right now. But I remember that the time to do maintenance and the time to change the complete engine of a Soviet tank (I think he compared the Leopard 2 to a T-72) was significantly higher (hundreds to thousand running hours) to a Western tank. I think he also wrote that the GDR had training tanks and non-training tanks to avoid breakdowns of all tanks in case of a conflict. It was a complete different design principle.