My 87 560 sec gas has 300,000 miles and is running ruff, I have replaced cap, rotor, wires and plugs. Just wondering should I spend another 400 dollars + on new injectors or consider complete engine overhaul.
Does anyone have a ballpark idea of what that would cost ?
Thanks
TTravis

A lot, depending upon what needs to be done. Two years ago I had my mechanic dig into mine as my oil leaks were becoming unmanageable due to leaking head gaskets. The big issue that we had was that many, many parts had to be replaced due to age - plastic parts, rubber parts, etc. etc. and this all adds up pretty quickly in $$. Also, you find things that you want to get done "while you are in there" - timing chain, fuel injectors, etc. My experience tells me that you will be in to the $5-6000 dollar range if you only need upper engine work done, and you really won't know that until you get the heads off. You might be better off buying a replacement engine, depending upon how long you want to keep it. I am sure others can give you more info. Good luck!

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John Gillespie
1988 560sec - 192k miles
2006 CLK500 - 40K miles
1995 E300 - 202k miles

Thanks for the info johng99, I did a compression test today and found 2 cylinders with 30 to 60 compression which is very bad. The car isn't worth 5 -6 thousand I may look for a used engine replacement.
Thanks,
ttravis

It may just be a head gasket. Are the two 'low compression,' cylinders side by side?

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84 300SD
85 380SE
83 528e
95 318ic

On the positive side, all the work I did on my engine radically changed performance. So much more responsive, feels quicker, too. I guess all those parts (and especially vacuum leaks) that gradually wear over the years take their toll. Getting things back to spec. in the top end of the engine was worth it to me as my car is a keeper.

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John Gillespie
1988 560sec - 192k miles
2006 CLK500 - 40K miles
1995 E300 - 202k miles