I believe the site is www.timevalve.com and to date they have been pretty good to me. Have their system on my 1986 190E 2.3-16 and after about 14 years or so the unit sprang a leak. I did not have a reciept any longer, so, since they are within 30 miles from me, I drove over. They looked, agreed they made it and fixed it. No questions asked. So, if you are looking for a good quality system that the manufacturers stand behind, give them a shot. Good luck, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)