I dont think its much to worry about but recently i noticed a 5 degree's increase in oil temp whilst driving around town, without being stuck in traffic. Normally oil temp sits at 90c & on motorways at 80ish. Any ideas what the increase could have been caused by? I have not emptied out the catch tank for a while so i dont know if that being abit full would be a problem? Oil level is full & the oil was changed recently.

Any ideas would be great.

P.S It was about 26c that day & driving style was harsh to moderate.