Originally Posted by BoilerUP

Find a current MEI and split the time. You log it as dual received, he logs it as dual given, you both log it as PIC. Call it proficiency training, call it instrument training, call it XC training, whatever you want. That way, you both win and are both logging it legit.

Most of my MEI time was in the right seat of a Seneca with a pilot that had not flown the Seneca before under the above circumstance. Always went into my logbook and theirs along the lines of "aircraft familiarization".