Thicker oil: yes. Oil cooler: I'm sure it wouldn't hurt but I don't think it's required. You've got a similar setup and I'm not running one. The Type R is said to come with an oil cooler but I've heard it's not very good. I haven't had any problems yet. I'd be more worried about blowing my engine because of tuning or fuel problems than my oil catching fire. Hence, I'd throw money into a standalone before I spent that money on an an aftermarket oil cooler kit.