Mobil Delvac 1 and Turbo Diesel Truck USED to be the same product, but no longer are. Look at the product data sheets on the Mobil site and you'll see that they're different.

M1 TDT is perfectly adequate and less expensive than Delvac 1.....you can get a 5 qt. jug at Walmart for $27 or so.

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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife