1981 Mercedes 240D Oil Test results
 

I wasen't sure about the quality of my engine as I have knocks at the initial startup so I had a $30 oil test done after 5000KM.

I have 300,000+KM on the engine and I ruled out the knocking to be the injectors which I plan to replace soon. I'm so happy with these results, I will continue on restoring the car. If the engine had shown wear or coolant etc, I may have decided to sell.

I recommend a oil test/analysis and a compression test for anyone who seriously wants to know the quality and durability of the engine. With the cars starting to push 30-35years old, its very difficult to tell if previous owners have neglected anything. Coolant flush's and regular diesel rated oil changes are key on these vehicles.



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Has anyone else had an oil analysis done?

I've used Blackstone Labs (IIRC ~$25). I know there's a few members on superturbodiesel who have done so as well.

Make sure you have decent fuel pressure to the base of the injection pump. I really believe it is a good ideal overall to make sure you have it. I like to see 15-19 pounds of fuel pressure.


Systems degrade with time. This one is cheap to restore if found to be substandard.

Here are my reports from the 300SD and 420SEL

http://www.peachparts.com/shopforum/tech-help/316346-420sel-300sd-oil-analysis-report-thoughts.html

I have on my 240D. I need to scan the results so I can post them. I had elevated copper in one but normal in the second which indicates bearing failure but the car is running great and the second analysis was normal. I will have another sample in a few months since the car only gets driven about 3-4k per year.