back int  the  late 70's  we put a few of those  coolers on  massey's and  Dad's  diesel  pickup--- yes  the dreaded 350 GM---   last  we heard  that truck   was  totalled in a  rear end wreck  with the third owner...  it has  350,000 miles...    and never was overhauled  or had a tranny problem...  it was a  1981 


We used the  &quot;cooler&quot;  as  a  fuel heater in the winters  <!-- s;) --><img src="{SMILIES_PATH}/icon_wink.gif" alt=";)" title="Wink" /><!-- s;) -->    and  from a  Physics  point of view   YES  they do work...