No supplemental heat, just basic kit. No Co-Pilot either.
PD engines have no heat issues, so even in coldest NE temps, tank and WVO at the pump are well above 160F.
Return line T's in after WVO filter so purging back-flushes filter with D2. PD engines actually heat the return fuel such that they have a stock radiator for the D2 return line under the car.
As of today, 96K miles. Not the slightest issue pertaining to WVO.

