REFLECTOR: Are engine/oil heaters worth it?

[Terry Miles]

Dear Anybody,
 

 <http://www.reiffpreheat.com/> http://www.reiffpreheat.com/ 
 
The above is a engine heater company that shows up each year at Osh.  I
am thinking that oil viscosity alone is sufficient to handle startup and
idle RPM to temps down to zero degrees F without using these
things...assumming I make sure I have good oil temp at takeoff.    They
make a ring-type heater that wraps around each cyl.  Or a cheaper
version that is just a big spot heater attached to the underside of the
oil sump.  
 
Are these good ideas?  I am trying to finish up my wiring plan and need
to decide on some of this stuff now if I can.  
 
Thanks,
Terry 
Illinois/Penn
IO540K

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