I had a ZVH 2.0l it had a mocal oil cooler, and temp guage/sender fitted in the sump plug.
I use to run the oil temp at 105 to 115 deg C.
I found that after a period of high power running at 30psi the temp would get upto 130 deg C.
I did not use the sandwich plate heat exchanger, I used a mocal 13 row oil to air cooler.
Simon.