In article , "Matt Barrow"
writes:

I believe such products (this thing, Reiff, Tanis) are for over-night warm
ups, not spur of the moment.


Why so? I find that my Tannis does a pretty good job after and hour or two.
After all, you don't have to get the engine up to operating temp. If I have
raised the engine temp 20 or 30 deg I have done a lot of good.

Chuck