As I said, the sulpher content went down about five or six years ago. It will probably go way down again soon. Watch out for injection pump failure when they take it the next step. If you have an early diesel, particularly a 123 based diesel or earlier, that has not been upgraded with hardened barrels, add just an ounce or two of oil with each fillup.

You don't have to get crazy with this. You can use ATF, or you can use about any engine oil. Just use CLEAN engine oil, don't get the idea of recycling your drained oil this way. If you had some sort of really good filter, you could probably get by with that. But you need so little oil, that you can just buy cheap oil for this purpose. I would not use rerefined oil.

Some time ago, I bought a case of Jet 30W cheapo engine oil and it has lasted a few years, and I still have some left. It actually looks like decent oil. When you purchase the premium oils, your really paying for the additives. You don't need additives for this purpose, just a small amount of clean oil.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles