Several web pages discuss the snake oil phenomenon.  Try
http://www1.surfsouth.com/~gdirksen/oiladd.html
for a good discussion of the main types.  Another site,
http://www.dragnbreath.com/dragnbreath/tn2aboutoiladditives.html actually
lists brands and classifies them by active ingredient.  Prolong is dealt
with, and there is also a discussion of synthetic oils.  The consensus:
most of them do more harm than good, and if they were so great, oil
companies would include them, or more of them in thier products.   Buy a
good motor oil, and save your money.
Rex Funk
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