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Silicone Di-electric Grease as stated in most owners manuals. Used it all the time when I had my C4. I remember seeing brand new C4's on the lots with cracked weatherstrip because it was such poor quality. On C4's it always cracked around the driver and passenger windows.
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24
Originally Posted by charley95
Silicone Di-electric Grease as stated in most owners manuals. Used it all the time when I had my C4. I remember seeing brand new C4's on the lots with cracked weatherstrip because it was such poor quality. On C4's it always cracked around the driver and passenger windows.