I was wondering if anyone had any idea if it is harmful to keep your block heater plugged in for a long time. I havent fdriven my 350SDL in a few days and have had the block heater plugged in around the clock since it has been extremely cold here in Michigan.

Thanks,
Frank

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Frank
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)