Ford Focus 1.6 TDCI engine oil capacity with the filter: 4.25 quarts or 4.0 liters (equivalent to 1.0 US gallons). Ford Focus 1.6 TDCI recommended engine oil: It’s advisable to use high-quality 5w30 engine oil for optimal performance (always refer to your owner’s manual for the exact type before adding new oil). 1p7eabY.