The analog cockpit version reports the proper oil temperature (the one calculated by REP). The G1000 version, instead, can only report the default internal oil temperature of X-Plane, which is totally useless in REP’s case. This is a known issue.
How-To: Choose the right oil for your engine
In this post we will talk about mineral oils for our airplane engine. How should you take care of oil with the Reality Expansion Pack?
This is a long topic so we’re gonna walk through a series of questions that will end with the most important: which oil should you choose for your engine?