| Deutsch | Abb | Englisch |
| obengesteuerter Motor | | overhead type engine |
| obengesteuertes Ventil | | overhead valve (ohv) |
| obenliegende Nockenwelle | | overhead camshaft (ohc) |
| obere Kurbelwellenhauptlagerschalenhälfte | | main bearing shell upper half |
| oberer Kolbenring | | top piston ring |
| oberer Totpunkt (OT) | | top dead centre (tdc) |
| öffnen | | pierce; undo; open |
| Öffnung | | hole |
| Ohmmeter | | ohmmeter |
| ohne Berechnung | | no charge |
| Oktanzahl | | octane number |
| Öl | | oil |
| Ölablaßschraube | | oil drain plug; sump drain plug |
| Ölablenkblech | | oil deflector plate |
| Ölabscheider | | oil trap |
| Ölabstreifring | | oil scraper ring; scraper ring |
| Öl-Ansaugstutzen | | oil pick-up pipe |
| Ölbad | | oil bath |
| Öldichtung | | oil seal |
| Öldruck | | oil pressure |
| Öldruckanzeige | | oil gauge; oil pressure gauge |
| Öldruckschalter | | oil pressure switch |
| Öleinfüllstutzen - Verschluß | | oil filling plug |
| Öler | | oil can |
| Ölfilter | | crankcase filter; oil filter; strainer |
| Ölfilterschlüssel | | oil filter removal tool |
| Ölkanne | | oil can |
| Ölkohleablagerung | | oil-carbon deposit |
| Ölkohle-Ablagerung | | carbon deposit |
| Ölkollektor | | oil collector |
| Ölkühler | | engine oil cooler; oil cooler |
| Ölleitung | | oil line; oil pipe; oilway |
| Ölmeßstab | | oil level dipstick; dipstick; oil dipper rod |
| Ölpumpe | | lubrication pump; oil pump |
| Ölpumpen - Zahnräder | | oil pump gears |
| Ölschlamm | | oil sludge; sludge |
| Ölsieb | | oil pump strainer; oil strainer |
| Ölspritze | | oil syringe |
| Ölstand | | oil level |
| Ölstand | | sump level |
| Ölsumpf | | sump |
| Öltank | | oil tank |
| Öltankdeckel | | oil tank cap |
| Ölversorgung | | oil charge |
| Ölwanne | | lower crank case; oil sump; sump |
| Ölwechsel | | changing of oil; oil change |
| On-board-Diagnose | | On-board diagnostics (OBD) |
| Original - Ersatzteil | | genuine part |
| Öse | | eye |
| Ottomotor | | petrol engine; gasoline engine |
| oval | | elliptic |
| Oxidationshemmer | | oxidation inhibitor |