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Originally Posted by four
2.) Aside from MAFs issues, I've read that there are oil leaks on the 3.5. What is usually the main reason why they leak, and is there anything I can do, other than general maintenance, to prevent the leaks?
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I'm the guy who had the worst oil consumption. I had to add a quart every 300 miles. We (well, Redlinemax.com) replaced my engine with one with 28,000 miles on it, so when Corey at Redline and I have a chance, we'll tear down the old engine and find out what the real problem is. I can tell you this much though: my pre-cats were completly shot at 160,000 miles. They were so bad that they actually clogged the main cat causing the engine to die due to excessive back-pressure. Until we tear down the old engine and inspect it, we cannot definitivly say if it was the pre-cats that caused the oil consumption by scoring the rings / piston walls or if the rings went causing the oil consumption and the death of the pre-cats was a consequence of this. Stay tuned, however, and we'll find the problem and the solution sometime within the next couple of months.
Oh, and there were no leaks. It was burning oil. However, there is a documented problem area for leaks: the rear valve cover. It'll leak around the center spark plug and drain into the plug well. If it is left too long, it may foul the plug. It's pretty easy to fix, however, and wouldn't act like a major leak like my oil consumption.