You might be missing the point, just a little. Saudi Aramco's breakeven production cost is, realistically, $40/bbl; optimistically $35/bbl. Best case scenario (for them), if the U.S. fills the SPR, it costs the Saudi's $1.4B in losses, and it props up U.S. producers. That may only last for a week, but the Saudis' cash reserves aren't infinite. They wanted to hurt Iran, drive U.S. (shale, in particular) competitors out of the market, and hurt Russia.
You might be missing the point, just a little. Saudi Aramco's breakeven production cost is, realistically, $40/bbl; optimistically $35/bbl. Best case scenario (for them), if the U.S. fills the SPR, it costs the Saudi's $1.4B in losses, and it props up U.S. producers. That may only last for a week, but the Saudis' cash reserves aren't infinite. They wanted to hurt Iran, drive U.S. (shale, in particular) competitors out of the market, and hurt Russia.