Ok so here's the deal. I've asked and yous have responded and I think I have done everything. Starboard motor oil temp runs HOT at higher rpms. Water temp on starboard motor runs 10 degrees higher then normal but that's it. I have backed flushed the system, flushed the heat exchanger and pulled the raw water pump to check the impeller. All is good and very clean. Any more suggestions before I have the merc tech look at it?
Thanks

Have you tested the oil temp sender and or gauge for starboard? Simple on board wire swapping will get it done.

No I have not. I have the gauges out due to relocating them to fit new Garmin. Ill switch the port and starboard oil temp gauges and see what happens. Where is the oil temp sensor?

Swap the HE's too. swap the senders, swap whatever you can.
I didn't see your other posts. Do you have bravo drives? Seems to me there have been some that get corrosion buildup in the pickup passage. On another forum they are calling that issue Bravo-itis.

Where and the hell are my oil temp sending units on my 8.1's???????? I'm so frustrated with trying to find info online. Then again there is none witch don't help!