Very interesting post on the Mindef website:
"When these tanks begin to enter service from 2008, they will replace some of Our Army's veteran SM1s. Minister Teo said, "MINDEF had been looking to replace the SM1s and the new tanks will be refurbished to push the Army's armour units to become a high-tech 3rd Generation Force." Commenting on the selection of the Leopard 2A4, Minister Teo added, "We looked at a number of alternatives and the German offer of refurbished Leopard tanks is a very cost-effective option for us to start replacing some of the SM1s. It has good mobility, firepower and protection, and is a good baseline for us to further upgrade the tanks for the next phase of 3rd Generation Armour." "
Suggest that consideration was more to replace 40+ year old AMX 13s.
Had the distinct impression that >75mm RHA penetration of the 120mm ICM P138 rounds could take top armor of many MBTs.
http://www.stengg.com/upload/6189HkG02hDGSjIYQGX.pdf
I think the anti-armor M42/46/80/718 penetration rates of the 155mm rounds (which ST also produces) are about the same ie 2.5inch RHA. With the exception of the M1 or L2, I had the impression that top armor of other MBT are unlikely to take these penetration rates?