both. they all are using Z24 Nissan engine, thats why they could have mass production. there is no other option yet. because no other engine in same class are producing in iran.
p.s: im wonder that what could have happened if we had not good relationship with the world like last decade and couldnt buy and transfer the technology of this engine, then we were not able even produce all these simple vehicles and equip all our military forces and proxies through the middle east. because no engine were accessible. but some still are delusional and have no clue how sanctions work and all the time are chanting slogans..
There are other options under production and are produced in hundreds to have a feedback and then put it to mass production. Iranian engine producers are already on the verge of becoming a world class quality producers.
We have a high tech company in Qazvin started the work on mass production of a Euro-6 family of engines... these engines will cover the needs of all classes (A, B, C) and are from 3 Cylynder, 1000 cc, 100hp, 4 l/100km to bigger 2000 cc models for bigger cars.
There is another company called IPCO already desingned and built and under going mass production phase new diesel engines. One of them is :
It is EFD-1 Engine: 1496cc, 120 hp, 356 nm, 5.2 l/100km and is Euro 5
We also have EF7-TC engine that is under mass production: It is 1650 cc, 150 hp, 215 Nm.
There is another set of new engines under development by IKCO. These engines are already designed and produced and is waiting for the new factory site to be built to start its mass production. This family has up to 160hp of power output, 280 NM of Torque and an exceptionally low consumption rate 4.7 l/100km for the most powerful model.
Btw, do u really think for a defense industry that can build warships, submarines, radars, air defense systems and specially all types of more power ful (marine, UAV and compressor engines) that is a WOW tech to design and build its own necessary vehicle engines!! Some of you just want to say something so others don't call you deaf! The range of military and civilian techs that Iran mastered in last couple of years is incomparable to what we had 6 years ago...or 10 years ago or even 3 years ago...