I am looking to add a FPHE to my 240D - i've been running 100% WVO for over a year now with no issues, single tank system with injection heaters 12v and 12v fuel line heater, im in los angeles so it doesnt get that cold ever, this sytem has been working great. - but, i'd like to add a FPHE just for insurance that my WVO is getting hot enough now that the "colder" weather is coming here.
I see lots of copper brazed/ stainless steel FPHE on ebay 20 plates for about $60- i've heard copper isnt so hot for WVO as far as poly goes..? any other options, or are folks having ok results with these?
I also see arctic fox has a couple stainless steel tube type exchangers, more like $150.
ideas?

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1981 240D ... 265k
1977 240D ... 265k
1977 240D ... 250k