Freightliner 122SD · fluids
Fluids & Fill AmountsHow much oil, coolant, DEF and gear oil this truck takes, and what specification to buy.
Set the year first
Then read the How much column as a refill quantity, not a dry fill. Fill to the dipstick or sight glass and treat the number as a starting point — a drain never gets everything out.
Fill amounts for Freightliner 122SD
| Fluid | How much | What to buy | Years | Source |
|---|---|---|---|---|
| Engine oil - DD13 (oil + filter)Change it: Per oil analysis program | 40 qt (38 L) | Detroit DFS 93K222 (CK-4) or 93K223 (FA-4) | 2017–2026 | Verified |
| Engine oil - DD16 (oil + filter)Change it: Per oil analysis program | 45.4 qt (43.0 L) | Detroit DFS 93K222 | 2007–2026 | Verified |
| Engine oil - DD13/DD16 total dry volumeChange it: - | DD13 49.7 qt (47 L); DD16 51.8 qt (49 L) | As above | 2007–2026 | Verified |
| Engine coolantChange it: Test at PM | Not verified - consult OEM service manual | Detroit Genuine Coolant / OAT extended life | 2013–2026 | Unconfirmed |
| Diesel exhaust fluid (DEF) tankChange it: Fill at every fuel stop | Order-specific | ISO 22241 DEF | 2013–2026 | Unconfirmed |
| Fuel tankChange it: - | Order-specific | ULSD, 15 ppm max | 2013–2026 | Unconfirmed |
| Transmission fluidChange it: Not verified - consult OEM service manual | Not verified - consult OEM service manual | Per transmission manufacturer | 2013–2026 | Unconfirmed |
Sources: DD Engine Oil Capacities (DTNA); DD Engine Oil Capacities (DTNA), GHG17 table
Two ways to wreck an engine in five minutes
Overfilling an oil pan aerates the oil and can damage bearings. Running a cooling system low can crack a liner or a head before the gauge even moves. Fill slowly, then check the dipstick or sight glass twice.