Probably depends on how well your 300TD is running. I would try a bottle of Redline Diesel Fuel Catalyst(RDFC) and see how much of a difference it makes. I found that by using it in my '85 300D, the usual clackety-clack of the engine is significantly reduced as well as the amount of smoke from the exhaust. The mfgr of RDFC suggests a full bottle at first as a "cleanup dose" then 1 oz every fillup after that. You may want to add more than 1 oz. Once again, it all depends on how well your engine was previously maintained.

Good luck and welcome aboard the the diesel club.

__________________
Frank
84 500SEL EURO 101K ( JUST LIKE MY 1ST WIFE. GLAD TO GET RID OF HER! )
85 300D 310K (sold)
90 350SDL 184K sold
83 300D 118K (sold)
88 300E 153k (sold)
93 400E 105K (sold)