Sure oil filter isn't your problem
I'm chasing a similar problem, never let oil go over 120 deg, sat at 70 on motorway its at about 120 deg.
Has this engine in another car and it was fine, brought this valver and that ran hot oil temps, swapped engines and still same problem, heater matrix was blocked so thought it mgiht be that, swapped it and it aint' done f**k all, got a rad i might change tomorrow, apart from that the only other thing thats orignal on the new car and not been repkaced or imported from old car wth engine are the gauges.
Can't believe it gets to 155 deg without totally f**king your engine, or tbh that you actually allow it to get that high.
Nyk, how the f**k can your car sit at 50 deg oil temp?!?!?!?
Mine never even did that with silkoine race oil