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NewellCrazy · 01-31-2013, 03:22 PM

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 NOAT was previously approved for use in Series 60 diesel engines, but was revoked in September, 2002.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.

01-31-2013, 03:22 PM	#11
NewellCrazy Senior Member Join Date: Sep 2006 Location: Sugarland, TX or Salida,CO Posts: 1,867	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 NOAT was previously approved for use in Series 60 diesel engines, but was revoked in September, 2002.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. __________________ Sean If Ain't a Newell, It Ain't Wurt Oonin!