It doesn't matter if Russia still has plenty of tanks if it can't use it in combat.
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Here are some examples of what I'm talking about:
Comparison of time to rebuild for select tank engines
Where are those numbers from? Are they real world or manufacturer specifications? Also apart from the Leopard tank, they are all equivalent.
Note also that MB873 is installed as a power-pack with integrated transmission which is another high-wear element. Replacement of Leopard 2 power-pack takes a maximum of 2 hours.
V92 (T-90, T-72B3) and V84 (T-72B) which are a development of V45 are not a power-pack with the exception of last versions of the tanks. They are very but cheap to manufacture but extremely time-consuming and difficult to maintain. On a regular basis the T-72 tanks in Polish service required as much as 24 hour period for complete maintenance of the engine and transmission.
Comparison of mean time between failure and other performance for Leopard 2A4 and PT-91 (Polish T-72M modification)
View attachment 97588
Are we seriously to believe a T-72 engine is 8 times more unreliable than a Leopard engine? I mean, breaking down after 25km??? Is this something the Ukrainians have encountered? I think this says more about the condition of Polish T-72s, or the Polish MOD have fudged the numbers to justify their purchase of overpriced German tanks.
Since Ukraine uses practically the same tanks as Russia, why are you comparing to German tanks?
Why would Russians have a harder time maintaining tanks compared to Ukraine? Ukrainian keep getting their tank repair sites bombed, while Russian ones are operating normally.
You are repeating old clichés used to denigrate Soviet platforms, which we've heard here many times, including directed at Chinese platforms. It may be true, but how is it any different for the Ukrainians?
As for using Onyx....enough has been said about that.