Originally Posted by donbrew

I'm still trying to figure out what name I could possibly call or argue about.
The simple answer is "I don't know". The pics look like green anti freeze not goo. The only way I can figure is that someone is spraying something green on it, maybe some sort of engine cleaner? There is no liquid that color that lives under the hood of a stock HHR.
Again, do not use silicone anywhere that it could get into the exhaust flow or the O2 sensors. It is deadly to sensors and catalyst.

O2 sensors have a through hole in them because the way they work is to compare the ambient air to the exhaust gas. Any silicone on the outside can get inside.

Originally Posted by PulpFriction

“Dielectric grease” is technically not an accurate term. It is a common usage term for grease with a high dielectric strength, I.e., it’s a good insulator. Such products also are designed to have a low film strength so that a good electrical contact is still achieved. Some greases (not “dielectric”) contain conductive ingredients like graphite and (somewhat counterintuitively) would be terrible for protecting electrical connections.

The same principles would apply to “dialectic compound,” a term which may be ment to differentiate it from a product intended for lubrication, which grease implies.

One common was dielectric grease for lubricating ignition points cams. But “bulb grease, is obviously not intended for lubrication, just another term for the same stuff.

I’m sure various products have various ingredients, and that the purveyors will extoll their superiority.

This comment is not copypasta, it’s just my quick explanation, not carefully edited, ‘cause I don’t feel like it right now.