Just noticed yesterday after driving on the highway for 25 minutes that a little bit of smoke was coming out of my hood after I arrived at my destination. I opened the hood and noticed that two of my injectors were wet. While running, one of them actually looks like it was leaking. There were some hoses on the injectors which were all wet (I guess they are the return lines some people here are referring to). I guess I'll have to start by replacing them. I wouldn't expect my injectors to start giving in at such "low" mileage - 156,561miles (I've read about people with over 300,000 miles on their original injectors).

Anything else I should know?

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver