The Magach 6 was the Israeli designation for the M60 tanks, while more advanced variants like the M60A1 were called Magach 6A. The Magach 6 was acquired as a response to new Soviet made threats like the T-62 and it's powerful 115mm cannons. The Magach 6 was fielded to the troops after arriving to Israel in 1971 and was liked by it's crew thanks to the extra firepower and it's mobility. However it's lack of protection against chemical weapons like ATGMs and RPGs was evident during the Yom Kippur War, were it suffered very heavy losses.
It was introduced in Update "Wind of Change". The Magach 6 is the same as an M60 tank, it relies on it's good gun and rounds rather than on mobility or armour. The M68 gun and it's APDS round specially can one shot most opponents, the HEAT-FS round meanwhile is better to deal with slightly armoured targets like SPAA and artillery. The improved turret in the M60 allows the gun to have better depression so try to use that to your advantage when pushing trough cliffs and mountains. Lastly, the Magach 6 lacks any sort of ERA common in future Magach tanks, so it's a good idea to stay behind and not in the frontlines, since most APDS and HEAT-FS projectiles would penetrate your armour.