Does the 1985 Mercedes-Benz 300SD need premium gas?
Fuel grade varies by trim — see the breakdown below.
| Trim (engine / transmission) | Fuel | MPG | Fuel/yr |
|---|---|---|---|
| 3.0L 5-cyl, Automatic 4-spd, RWD | DIESEL | 21 | $3,700 |
| 3.0L 5-cyl, Automatic 4-spd, RWD | DIESEL | 19 | $4,100 |
The EPA records the fuel each version was tested on. Whether premium is strictly required or just recommended is an owner's-manual detail the EPA dataset doesn't include — so we don't guess it.
2 trim(s) · EPA FuelEconomy.gov · retrieved 2026-06-14.