Indeed... Looks like vol spikes when oil jumps (which, I guess, makes sense, since these jumps often occur when there's actual geopolitical uncertainty). And, obviously, shorter expiry vol is always going to move more than longer expiry. So it kinda makes sense...I am more looking from intraday point of view in short term to take some sort of swing trades based on how different IVs are moving. Normally, IV Short/Term rises when the underlying is falling and vice versa. But looks like oil behaves differently.