benzhacker has the definitive post on this thread. I haven't torn down an engine, but I have successfully run a 1983 300 SD for 5 winters and summers in VT with little or no trouble on WVO. I have a heat exchanger, inline heated filter, and separate system with solenoid switchover. I run 75 miles a day on my commute have gone on several long trips with no breakdowns. The engine has less ping on WVO, shifts gears more smoothly, but slightly less acceleration. Would do it all over again.