I have been running various blends of various waste oils (WVO, WMO) and unleaded gasoline since Feb, 2007 on a 1983 Chevy 6.2L diesel with a Stanadyne Rotary DB2 IP. I have started the engine with no difficulty on an 80/20 (WVO/gas (petrol)) blend down to 3F (-16c) without the use of a block heater.