Originally Posted By: Petersubaru
I ended up getting a tube of Sil-Glyde SG-8 at NAPA for $6.99. Advance Auto also had Sil-Glyde SG-4 but it was amber colored verses the whitish NAPA Sil-Glyde. NAPA version also said "Contains Silicone" and a temp range of -20F - +600F. AAP Sil-Glyde didn't mention silicone and the temp range was -20F - +400F.
I believe you got caught up in some marketing mis-ques! I know, because I also scrutinize (OCD) purchases and thought there were different Silglydes.
A look at the AGS web site shows SG8 and SG4 to be the same:
http://www.agscompany.com/lubricants/automotive/168
Furthermore, if you look at their MSDS you will discover that SilGlyde is not a true silicone grease like the Motorcraft or Dow products.
SilGlyde contains less than 13% silicone.
Amber vs. white/clear? An older tube will turn amber. Stick some out in the sun and it turns yellow in a few hours. Real silicones don't do this. I called the company and the tech. said it was probably the
castor oil in the grease that might be turning color.
Their product tech. sheet also waffles on the 400F vs. 600F temperature range. Check it out.
In the "palm under water" test, the Silglyde is not as water proof as true silicone.
In spite of all this, my use of various new technology brake grease was disappointing and I returned to Silglyde as my favorite. A lot of old timers use it for a reason.
I would not hesitate to use the Ford product also. It probably has better water resistance, if that is a problem. I think the temp. thing is overplayed, unless you are talking high performance apps., just my 2 cents.