No.: 15 TS-3
April 17, 2015
TO:

Service Locations

FROM:

Service Systems Development

SUBJECT:

Detroit™ Coolant Change From Nitrite Organic Acid Technology
(NOAT) to Nitrite-Free Organic Acid Technology (OAT)

ISSUE
In June of 2015, Daimler Trucks North America will be changing from Nitrite Organic Acid
Technology (NOAT) Extended Life Coolant (ELC) to nitrite-free Organic Acid Technology (OAT)
ELC. Under certain circumstances, the use of NOAT can lead to coolant breakdown.
A revised version of the Detroit™ Coolant Service Information publication (DDC-SVC-BRO0002) will be released in conjunction with the OAT launch.
Approved OAT coolant products can already be found in a revised version of Detroit™
Approved Coolants publication 93K217 available on ddcsn.com. Under Literature, select
“Lubricants/Fuels/Coolants”. Then select “Approved Coolant List” to view the Detroit™ 93K217
approved coolants list. The link is shown below, but is subject to change without notice.
https://extranet-ddc.freightliner.com/Support/OnHighway/Manuals/Lubricants_Fuels_Coolants/Power_Guard_Oils/index4print_93K217.asp
Other information about OAT coolant:
• Service intervals for OAT are the same as for NOAT.
• For a truck that is factory-filled with NOAT, it is possible to top off with OAT. This is
preferred instead of topping off with NOAT.
• For a truck that is factory-filled with NOAT, it is not necessary to immediately replace the
coolant with OAT. The NOAT coolant can be replaced with the normal drain/refill
process at the applicable Preventative Maintenance interval.
• For a truck that is factory-filled with OAT, do not top off with NOAT.
• All coolant suppliers that provide NOAT also provide OAT.
• Detroit™ Power Cool Plus ELC is already an OAT coolant. Part numbers for various
quantities are in the Coolant Service Information publication (DDC-SVC-BRO-0002) in
the appendix for Detroit™ Cooling System Maintenance Products. This is available on
ddcsn.com. Under Literature, select “Lubricants/Fuels/Coolants”, then select “Coolant
Service Information”, then select “DDC-SVC-BRO-002”. The link is shown below, but is
subject to change without notice.
http://ddcsn-ddc.freightliner.com/cps/rde/xbcr/ddcsn/DDC-SVC-BRO-0002.pdf

Detroit Diesel 13400 Outer Drive, West / Detroit, Michigan 48239-4001

15 TS-3

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4/17/2015

OAT is also approved for use in Series 60®, Series 50®, MBE 4000®, and MBE 900®
engines.
Daimler Trucks North America factory-filled NOAT and OAT coolants are both red in
color. However, not all commercially available ELCs are red in color.
Coolant extenders are available for OAT.
The sticker on the radiator surge tank will be changing to show the truck was factoryfilled with OAT.
There is no change to Standard Life Coolant (SLC) even though it does contain nitrites.
The silicates in SLC prevent the nitrites from reacting with cooling system components.
Some NOAT coolants do not contain silicates so there is nothing preventing the nitrites
from reacting with the cooling system.
Never mix SLC and ELC.

OAT coolant can be tested by:
• Lab Testing (Detroit™ preferred coolant testing methodology, such as Power Trac
Analysis for ELC using sample bottle Detroit™ P/N: 23539088)
• Freeze Point Check (refractometer)
• OAT ELC Test Strips. These are commercially available from coolant suppliers, such as
from Old World Industries P/N: OWI FXATK4. The newly designed test strips will detect
the organic acid levels in the coolant and are therefore more effective than traditional
NOAT test strips that only detect the nitrite level. OAT ELC test strips can also be used
to test NOAT coolant as the actual organic acid concentrations are similar to OAT.
Because NOAT nitrite test strips only test for nitrite, they should not be used in OAT
systems. The improved ELC testing should lead to improved maintenance practices for
customers, and reduced costs.
• pH test strips. These commercially available test strips indicate the pH level in the
coolant. For trucks filled with NOAT, a pH level of 10 or greater indicates the need to
drain and refill the cooling system with OAT.
CONTACT INFORMATION
Please contact the Detroit™ Customer Support Center at 800-445-1980 or email
[email protected] if you have any questions.