EEK!!!
Sounds way to high on oil temp IMHO! Motul 300V is 15/50 ester based, If you are worried about oil temps, and you consider that a 944 Porsche Turbo [2.5 litre single turbo therefore similar spec] has 3 litres more oil capacity than a Skyline GTR & is a lighter car, then put an oil cooler on your must do list. Mine, BTW does not interfer with the air flow to the standard i/c. It is has been said many times on this forum - the best way to look after your engine is oil, oil & OIL. if you use the search facility there was a thread some time ago called Liquid Gold - worth a look.
Rgds Ian W