No required fluid or grease additions to the 126 boots. However to lenghten the life of the boots consider buying 303 Aerospace Protectant and spraying the boots with the prtectant. It is designed to preserve rubber. YOu can usually find it at RV stores, They recomment spraying it in tires to prevent UV damage and dryrot on the tires. The verylarge bus RVs can have a $4000 for tires. Good idea to rpreserve those babies. I have used it on the TD and it seems to make the rubber softer and pliable. I did the boots when I rebuilt the rear suspension.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car