2008 Mercedes-Benz S550 4MATIC Questions

All 2008 Mercedes-Benz S550 4MATIC Questions

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The other day I was driving my 2008 s550 battery appeared on his dashboard and the radio went lower and it's scaring got a pinch tighter I turn the car off and started back up it was okay for another 10-15 minutes ple...
AUDIO, RADIO NOT WORKING. MESSAGE: NO SIGNAL.
RADIO DOES NOT WORK. NO SOUND, NO STATIONS. MESSAGE ON SCREEN: DEVICE NOT AVAILABLE. NO SOUND ON GPS.
shock was changed 2wks ago and had no problem and now it says shut car down to low after the malfuntion light comes on car looks even not tilted to one side don't hear pump coming on car does not rise even when i hit ...
Would it be harmful to put light coat of silicone paste on spark plug boot?????