What is the name of the highest known mountain within our Solar System?

Yet again answers contradict not just one previous questions but several. Interesting that the question asks for highest mountain but answer talks about 'feature'. Probably Wikipedia up to its usual inaccurate standards

No, that's wrong; the mountain, with the highest elevation ever reliably measured, in the known Solar system is Olympus Mons. Due to the lack of oceans on the other rocky bodies, the heights of their features are measured relative to the mean local surface. And by this criterion, one of the peaks of the Rheasilvia crater is the 2nd highest in the Solar system. If, however, measured relative to the lowest point of the crater, it's the highest (but that'd be, somewhat, like measuring the height of Mount Everest relative to the Challenger Deep).

Almost every single source puts Olympic Mons as the highest.

Nearlyfit, Something useful I had found on Google... Here it is : The solar system's tallest mountain is the central peak of Rheasilvia on the asteroid Vesta, estimated at up to 25 km from peak to base. Among the terrestrial planets the tallest mountain is Olympus Mons on Mars, at 21.9 km. Olympus Mons is the largest planetary mountain in the solar system, but there's a mountain on the asteroid, Vesta, that is the largest mountain around. Called Rheasilvia, the mountain is a mere 315 feet higher than Olympus Mons.

tallest mountain is Olympus Mons

Nearlyfit, I agree woth you