I installed a http://www.fumotousa.com/ on my 300sdl, because I was having problems with the thread not wanting to hold anymore after 20+ years. After I installed it, I haven't had a problem.

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Professional greasecar installer
Austin TX


98 Jetta TDI with grease car kit + veg-therm (totaled)
87 MB 300SDL running on B99 / greasecar kit + 30 fphe
www.austingreaseguys.com