for next time to get this nut loose used one big hammer and smaller one you use against it on opposite side..after it will be easy to unscrew the oil line nut.No need to buy a new line .You can go to Northridge to ORME bros. and they will make you new one with breaded hose on it..cheaper then new oil line..i had my redone back in 2008 and still ok after all these years..
The hammer trick work also at the nut by the thermostat
https://ormebrothers.com/