HOW-TO SECTION Table 17 Fully Formulated Glycol Coolant Limits with TMC RP-329, TMC RP-330 Chemistry Type A (50/50 Coolant/Water Mixture) Recycled Antifreeze — Antifreeze or coolant recycled by reverse osmosis, distillation, and ion exchange, properly re-inhibited to meet TMC RP-329 Type A or TMC RP-330 Type A requirements, has been demonstrated to provide service equivalent to virgin antifreeze. Recycled antifreeze or coolants of these types are preferred. Other recycled coolants, especially coolants recycled through filtration processes, are not recommended . 600,000 miles (960,000 km), or 10,000 operating hours, whichever comes first. Refer to Coolant Inhibitor Test Intervals in this guide.
The cooling system should either be equipped with a blank coolant filter, or the coolant filter and piping may be omitted from the system. OAT fully formulated antifreezes are available as concentrated and pre-mixed. Concentrated antifreezes should be mixed 50% (50% antifreeze, 50% water). EG/Water + OAT Inhibitor or PG/Water + OAT Inhibitor Ethylene glycol and propylene glycol are also available with a OAT corrosion package. These coolants require less maintenance over the useful life of the engine. OAT coolants, maintained as detailed in the Maintenance section of this guide, may be operated up to 4 years, OAT coolants should not be mixed with conventional coolants.
If they are mixed, no damage will result, but the long-life advantages of the OAT coolant will be lost. In this event, the coolant should be maintained as a fully formulated IEG coolant, not as an OAT (Organic Acid Technology) coolant. 94 All information subject to change without notice. DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Fully Formulated Glycol Coolant Concentration Limits Boron 125 – 500 PPM Nitrite 900 – 3200 PPM Nitrate 200 – 3200 PPM Silicon 50 – 250 PPM Phosphorous 0 PPM pH 8.0 – 11.0