If a engine remained unused (brand new)for 1-2 years ,should we change the oil?

No if it has not been in service at all, just check it and be sure it is at the CORRECT level. If the engine is sealed up should not be any problem except moisture from condensation but that should be minimal. Even with the temp. curve in Mn. Can always change after running engine to be sure it is ok. IF you do drain this new oil save it, may need some in your lawn mower!!!

Likely it should be fine....but why take a chance. I would change the oil to be on the safe side.

I agree with both of you, but I am saying why take a chance just drop that oil and give the vehicle a fresh start with new oil, also check antifreeze color and levels, and all the other fluids for color and proper levels, and just a total visual check of the overall vehicle. (dont forget tires, and underneath the vehicle. one question i do have is what is the mileage on the vehicle? enjoy

never hurts to service eng at any time

i would say it depends on whether or not you have run the vehicle periodically(once a month) while it was sitting. if vehicle will sit for ext. period of time, it is recommended to do so. theoretically it should be fine but drain a sample out and see how it looks. if clear than it should be fine. if milky or dark than change it. vehicle sitting that long should have inspection any way(peace of mind).