This happened today:
That’s a 1981 Peugeot 504 (diesel) that belonged to my grandfather. After his death about 20 years ago it’s been sitting first on the original garage and lately inside this shed that we are fixing up.
The tires have an inner tube as it was usual on that era and that’s an advantage, I doubt that any contemporary tubeless would still be sealed after spending so long being flat.
I had a bit of space to speed up while pushing and the front wheels went by with relative ease. However, there’s a small step and I couldn’t make it go further with the initial momentum alone.
I lifted the car with a jack and made a small ramp out of bricks and a slab of wood. I carefully released the jack and the car slowly moved on its own. The underside looks quite good for a machine of that vintage.