Detroit Diesel Coolant
Detroit Diesel Corporation does not recommend the use of long-life coolant with nitrite in their medium-duty and heavy-duty engines. This also includes Mercedes-Benz engines (MBE 900 and MBE 4000).
This is in response to field complaints from vehicles using NOAT (Nitrite Organic Acid Technology) or extended-life, factory-fill coolant. NOAT was previously approved for use in Series 60 diesel engines, but was revoked in September, 2002. NOAT coolants have never been approved for Mercedes-Benz engines.
The correct coolant to use in Detroit Diesel and Mercedes-Benz medium-duty and heavy-duty diesel engines is conventional (green), fully formulated (pre-charged with SCAs), low-silicate, and phosphate-free. The specification used for the coolant is TMC RP-329; Type A (The Maintenance Council, American Trucking Association). Propylene glycol coolants of this type are covered under TMC RP-330, Type A.
Universal Lubricants’ Dyna-Plex 21C Extended Drain Engine Coolant (pre-diluted) and Dyna-Plex 21C Fully Formulated Engine Coolant meet or exceed all the requirements for use in Detroit Diesel and Mercedes-Benz medium and heavy-duty engines.
I believe only 2-cycle Detroit Diesel engine which have dry sleeves are 6-71 & 8-71 bus series. The 6-92 & 8-92 are wet sleeve as well as most modern diesels.
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Sean
If Ain't a Newell, It Ain't Wurt Oonin!
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