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They're not prone to sludging, but rather oil burning due to poor piston ring design. The rings bake into the grooves and let oil past. Doesn't matter if you run synthetic or dino; doesn't matter if you change every 3000 miles -- it's just a bad design. On the other hand, if well-maintained, they will last a very long time. The key is to keep the rings from getting stuck in the first place. Everyone has their advice on how to do it, just keep in mind that there's a difference between freeing already stuck rings, and keeping rings free in the first place. Keeping them free, by some accounts, is as simple as adding Marvel Mystery Oil 500 miles before each oil change. I assume something like Auto-RX or Neutra would also do the trick. Once they're stuck, they're a bear to free: Auto-RX, multiple piston soaks, Neutra, solvent flushes, etc. all will have a hard time touching it. Some have had success with multiple piston soaks using Berryman's B-12. I've had some luck with multiple Auto-RX treatments, a couple of piston soaks, and the consistent use of a thicker, quality synthetic (Delvac 1, soon to be Redline). And that's the Saturn spiel ...
