In article ,
says...

Don't be a sucker. "Silicone" spray, such as the Gunk brand you buy at
Home Depot or the auto parts store, is *not* silicone. It is a few drops
of silicone oil in a bulk of petroleum distillate, which is to say, not
significantly different from WD-40.

You appear unaware that there are thousands of different compounds which
can be distilled from petroleum, and *all* of them can be referred to as
"petroleum distillate". Educate yourself here

http://www.protectall.com/artmyths.htm

where you can learn about the many different chemicals that fall under
the generic heading "petroleum distillate"

and here

http://www.wd40.com/Brands/pdfs/msds...aerosol.us.pdf

where the MSDS for WD-40 shows that its composition isn't even remotely
similar to that of Gunk Silicone Spray Lubricant.

Read the label or MSDS, and you'll
find that silicone is the last ingredient on the list.

Copied verbatim from the back of a can of Gunk Silicone Spray Lubricant,
p/n AMS9-14, that I have in my garage:

"Contains petroleum distillate (CAS# 142-82-5), propane (CAS# 74-98-6),
Dimethyl polysiloxane (CAS# 63148-98-6), and water (CAS# 7732-18-5)."

Doesn't look to me like silicone is "the last ingredient on the list."
Maybe it does to you.

Actual silicone oil
is expensive, so you won't find it in a big can for a few bucks.

Here is an example:

http://householdproducts.nlm.nih.gov...nds&id=7007009

From the fifth line under "Brand Information":
"Date Entered: 1996-09-03"

Do ya think that might be just a little bit out of date, that the
formula might have changed some in the last TEN YEARS??