Oil & Coolant Capacities
Verified Factory Specs
Commercial Heavy Duty Diesel Engine Coolant Capacity Matrix
Factory OEM cooling system capacities for Class 8 commercial trucks. Engine block only volumes, complete chassis radiator fills, coolant chemistry standards (OAT Red / ELC), and thermostat operating temperatures.
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Class 8 Heavy Duty Diesel Coolant Fill Standards
Total cooling system capacity in a heavy-duty commercial truck includes the engine water jackets, radiator core, surge tank, heater cores, and auxiliary transmission / oil coolers:
| Engine Model | Engine Block Only | Typical Chassis Complete Fill | Recommended Coolant Chemistry | Thermostat Temp |
|---|---|---|---|---|
| Cummins ISX15 / X15 | 5.5 Gal | 13.5 Gal (51.1 L) | Heavy-Duty Extended Life OAT (Red/Nitrite-Free) | 180°F (82°C) |
| Detroit Diesel DD15 (GHG14 / GHG17 / Gen 5) | 5 Gal | 12 Gal (45.4 L) | Detroit Power Cool Plus (OAT Red) | 190°F (88°C) |
| Caterpillar C15 & C15 ACERT (6NZ / BXS / MXS) | 6 Gal | 14 Gal (53 L) | Cat ELC (Extended Life Coolant Red/Strawberry) | 190°F (88°C) |
| PACCAR MX-13 (EPA10 / EPA13 / EPA17 / EPA21) | 4.8 Gal | 11.5 Gal (43.5 L) | PACCAR Extended Life Coolant (Red OAT) | 185°F (85°C) |
| Detroit Diesel DD13 | 4.5 Gal | 11 Gal (41.6 L) | Detroit Power Cool Plus (OAT Red) | 190°F (88°C) |
| Caterpillar 3406E (5EK / 2WS / 1MM) | 5.8 Gal | 13.5 Gal (51.1 L) | Cat ELC (Extended Life Coolant Red) | 190°F (88°C) |
| Detroit Diesel DD16 (Heavy Haul 600 HP) | 5.5 Gal | 13 Gal (49.2 L) | Detroit Power Cool Plus (OAT Red) | 190°F (88°C) |
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Related Heavy Diesel Engineering Tools
Cross-reference other factory specifications and diagnostic tools for commercial diesel engines:
Technical Reference Citation: TMC RP 329 / ASTM D6210 Heavy Duty Coolant Standards