Take it to a radiator shop and they will let you know if it can be fixed. If you want, you can just take the cooler off and buy the OEM oil line for the 748. The 748 did not come stock with an oil cooler.
Are you sure it's not just the line cracked at the fitting?
If it is one of the SP, SPS, or R variants I believe they did come with an oil cooler. 2nd the radiator shop idea.Take it to a radiator shop and they will let you know if it can be fixed. If you want, you can just take the cooler off and buy the OEM oil line for the 748. The 748 did not come stock with an oil cooler.
Are you sure it's not just the line cracked at the fitting?