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This was on my Volvo Diesel which uses a different type of Fuel System in which the Fuel Injection pump is totally lubed by Diesel Fuel and there is a Lip type Seal on the Pump Dive shaft.
I had been using a lot of doses of the Power Service in that because if I get on the accelerator pedal much gray smoke comes out. The higher Cetane of the Power Service diminishes that as the fuel burns better.
However, I had that a Viton Fuel Injection Pump Shaft Seal fail badly and unusually and I don't know if it is from the over use of Power Service or some other issue.
See attached pic. I have never seen a seal fail in this manner before and I worked in a Fuel Injection Shop for 5 years. Note that your Mercedes does not have similar seals on it but the older VW Diesels do.
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84 300D, 82 Volvo 244Gl Diesel
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