Caliper Grease for Dielectric Grease

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Jun 12, 2020
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Wanted some thoughts here. I maintain a fleet of Hyster forklifts running Mitsubishi 4cyl engines. We had run into issues after pressure washing them with moisture in the spark plug cavities causing a misfire. I had been using Silglyde on them and it would be almost crusty when I pulled the coils. Switched over to a blue synthetic caliper grease and the problem has largely disappeared. Any long term issues using caliper grease on these? I figured it's gotta be safe for rubber and can take the heat.
 
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I'm not sure honestly, i went out and bought a jar of the 3M silicone paste from advance auto but it is pricey. My mechanic friend uses Permatex silicone paste and has good luck with it.
 
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Use proper silicone dielectric grease for electrical, not thicker silicone paste, and not caliper grease which is not a "thing", rather an application which several different grease formulations could be marketed towards. More often than not, if a caliper grease is called that instead of silicone paste, it has some undesirable solids like a metal or ceramic in them which you don't want on electrical connections.
 
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Silglyde is not pure silicone so that is why you may have noticed the difference. Most brake lubes are silicone (Dielectric Grease) based but Silglyde is not.
 
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Sil-Glyde is sold as both a brake lube and dielectric grease. I've been using Dow 111 for both plug boots and brake pin lube(if a special grease isn't called for). The Dow stuff is siloxanes and silica.
 

Creekside

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Originally Posted by bdcardinal
Motorcraft XG-3A is listed as a caliper lubricant and dielectric grease.
That was my main reason for going this way. I'm in a town of 1200 people and dielectric grease in any decent quantity has to be ordered. This brush top can will last a long time.
 
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Did you buy a true silicone brake/dielectric product or are you using the "blue synthetic caliper grease" you stated in your original post? Sil-Glyde is a castor oil based lube with a trivial amount of silicone in it. AGS markets a separate grease for dielectric use.
 
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