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I just installed a block heater in my 300D and it is rated at 400 watts (the car has to live outside of the garage this winter). The heater is made by Zerostat/Temro in Canada for M-B (220D, 230, 240D, 300D, 450SL/SEL). Believe it or not, the instructions do not say anything about how long it needs to be on to warm the coolant enough to ease starting! I researched other posts on this site and the consensus was 2-3 hours, with 3 hours needed when it is colder (10-20 degrees F. and colder). However, no one mentioned the wattage of the block heater which has a large impact on how long it needs to be on.
As I recall, an extension cord with 16 gauge wire should work fine (up to 100'). 400 watts divided by 110 volts = 3.636363 amps.
Good luck!
Tom
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America: Land of the Free!
1977 300D: 300,000+ miles
American Honda: Factory Trained Technician & Honor Grad.
Formerly:
Shop Foreman;
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.
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