I used Marvel Mystery Oil about 10 years ago. I noticed no
difference when added to the oil.  I noticed minor spark plug
fouling when added to the gasoline.

Marvel Mystery Oil did have applications for me. I diluted it
50/50 with mineral spirits, and then I used it to lubricate
small parts in my home and in my son's Radio Controlled trucks.
I think it makes a great lube when used in various dilutions.  I
use it where I used to use 3 in 1 oil.  It takes the heat
generated by friction better i.e. in a fan.

Bill

----- Original Message -----
From: Tony Peet <tpvw@HOTMAIL.COM>

The "Marvel Mystery Oil" (available at Longs and NAPA)
immediately increased
my avg highway mileage to 19mpg from 15mpg  -- and I have
experienced a
noticeable increase in power.