When I was going through the same process, I made a decision to go with thick mineral oil. The pag and ester oils just don't play with r290 as well as the old stuff. Also, the stink oil in camp gas bottles is mineral oil based as well. I figured that the oil thinning issue and the superheat conundrum would both be solved at once. The system has been doing well since I got rid of a few design bugs.
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