juha_teuvonnen

Russians used these in their tanks

T-64 was equipped with 5TDF engines
T-80UD was equipped with 6TDF

These engines required more careful maintenance when compared to Russian V12 diesels (T-55, T-62, T-72). The early 5TD series engines required to be fully heated up prior to driving. This rendered them close to useless in winter, because the enemy forces generally don't have a habit of give you advance notice about their attack.