There is no oil flow while engine is off so heat is not being transferred to oil through OEM heatexchanger when auxiliary heater is working. Fitting electric pump to push oil through engine and OEM heatexchanger would be tricky and would require powerful pump drawing a lot of current. I was thinking of lower powered electrical pump just sucking up oil from sump, pump it through external heatexchanger and dump back in in the sump.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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