You call that sludge? That's nothing. THIS is sludge.





On a 2009 Cadillac I got used over 2 years ago. I took the car in for warranty work to replace the timing chains, but when they saw that, they wouldn't do it under warranty. I dragged it home and did it myself. 10 or so hours for the chains, another 10 with q-tips, plastic scrapers and brake cleaner got it cleaned up like this.