C'mon guys? The guy was asking a legitimate question. Your fairly useless responses aren't in the BITOG tradition.
caveatipse: Why do you think you need an oil cooler in your Yaris? Your answer will help us help you. In any case, hot oil (around 180-200F) is a good thing in terms of MPG, engine longevity, etc. If you have a reason for a cooler, such as the turbo option discussed, that could be another issue but usually oil coolers are in response to a particular problem, such as overly hot oil that's consistently running well above the temperature where viscosity rated (212F). ANything up to there is "normal." Excessive oil temp is usually discovered via an oil temp gauge, either a standalone or via an OBDII device such as the Scangauge (assuming the Toyota system allows that parameter to be read). Anyway fill us in.