Recently began adding a cocktail of PowerService and Marvel Mystery Oil to the tank when I fill up. ('85 300sd)

For the past year, I have added a dose of PowerService to every fillup. Engine runs much quieter/smoother, and hills are a little easier to climb.

But, I was surprised how much smoother and quieter the engine runs when I add about 8oz of Marvel Myster Oil to the fuel. Quite the difference.

However, I am wondering about the long-term effect of using these products at every fillup. Is any short-term gain cancled by the long-term effects of adding these chemicals?

While it probably won't harm much, the long term effect is that adding all that stuff costs money that isn't necessary.

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg

family dollar sells dextron for 1.25 try that in your tank you will be surprised
how smooth your diesel will run..