Ok, I have read almost all the posts having to do with synthetic oil. I have been using conventional oil since I have owned the car and I am now due for the next oil change. Since my car has 145,000 miles on it now I am know thinking that converting to synthetic will really allow my engine to last longer without as much maintence on parts that suffer from friction. One of these parts being the timing chain and tensioners. They have not been replaced and I am not planning on replacing them, just gonna drive it 'til it dies. Would synthetic help something like this?

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500