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A block heater is the way to go.
The problem is the oil hangs low and is away from the rest of the mass of the engine block. If you heat just the oil and not the block the oil will turn back into honey as soon as it get pumped into the cold block.
When I built my diesel engine I installed two 650w block heaters.
Next gas engine I build will get a block heater from now on too.
125 watts isnt much. Its better than nothing.
Ripping out a freeze plug and putting in a block heater would be the best way to go.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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