All god advice. The hardest part of the fuel injector replacment is cracking the nuts on the injectors. It is a little akward to get tools in there. Other than that, quite easy. I bought genuine bosch injectors but not through benz and they cost me AUD30.00 each. So about US$135.00 all together. But do the diagnosis as discussed first. Don't just throw money at it.

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Andrew
300e 294,000mi
380sel 185,998mi
380se 309,980mi