We must clarify some terminology here. About four or five years ago, our government in its infinite wisdom reduced the amount of allowable sulpher in diesel fuel. At that time, older injection pumps without hardened barrels required additional oil as preventive maintenance to prevent damage. In my old 240D and 300D, this is a requirement.

Yes the "low sulpher" diesel fuel that is now being proposed is not yet in the pumps, but the "low sulpher" fuel begun in 1996 is.

About five years ago when that stage of "lowering the sulpher" started, injection pumps started hitting the clean rooms in quantity.

If you have a diesel with an injection pump built before about '93 or so, a jigger full of oil added to every tank is very cheap insurance.

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