Funny you should bring that up- I did try. Used a 24" breaker-bar with 3' cheater-pipe and..not a budge!! After doing a search found a few tales of cracked blocks. So, no Block heater. Oh well...

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2dieseljohn
1979 300sd (283,000+) Road Trips
1983 240D 4-speed (350,000+) Daily Driver
1967 E-TypeS1 in bits and pieces