Is anyone using the simple in-hose heaters--the type that you splice into the lower radiator hose--which are supposed to radiate enough heat to make a difference in the block?

Are they worthwhile?

Also, does anyone have experience with the more complex ones, which also splice in some kind of tank and circulate the antifreeze through?

I know the latter type are expensive, and I'm not sure how I could plumb that into the old-type CC system setup with the servo.

Thx

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22