I have been using rotella-t syn since it came out and i am quite impressed.. I use it in 2 of my 3 turbo diesels...
mine has 190k my wifes has 140k

my older 1992 has 201k and im still using mob 1 in her only becasue of what marshall suggested about the seal swelling additives...

but saying that i have to say that i have not had any probs with rotella syn... seems to control the sulfer better

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1994 S-350 6cyl Turbo Diesel 158k

1998 300d 6 cyl Turbo Diesel 143K

1993 2.5 124 Turbo-Diesel 236

1990 2.5 124 Turbo-Diesel 228k

1983 SL-500 EURO W/HEATED SEATS 40K

SOLD 1977 Jaguar XJ6 Coupe Antique Roadster 85K

SOLD 1993 2.6 6 cyl 190 E 150k

SOLD 1992 2.5 124 Turbo-Diesel 204k

RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH