Dex-Cool Extended Life GM Engine Coolant Problems: Information about Dex-Cool Extended Life Engine Coolant crystallization (sludge) problems.GM Lemon Cars: Has complaints about GM vehicle problems and GM customer service. Visitors can add their complaints to the site.GM Piston Slap -- Like a Knock: Detailed information about "piston slap" with GM engines and what you can do about it. Also has forum & links areas.GM Truck Lemon Center: Information about manufacturing defects in the 1999 - 2001 GM trucks and how to resolve them. Includes a listing of manufacturers service bulletins and recalls, postings from other owners about their problems and resolutions, and information about GM buy-backs.GMSucks.net: A complaint site about General Motors. Stories, links, and a forum is included to allow guests to gather information and vent about the company.