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1. (WO2019007857) USE OF A PARAFFINIC GASOIL
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C L A I M S

1. Use of a paraffinic gasoil in a diesel fuel

composition for reducing the build up of deposits in an Exhaust Gas Recirculation (EGR) system of a compression ignition internal combustion engine.

2. Use according to Claim 1 wherein the paraffinic gasoil comprises greater than 95wt% paraffins, based on the total weight of the paraffinic gasoil.

3. Use according to Claim 1 or 2 wherein the paraffinic gasoil comprises greater than 98wt% paraffins, based on the total weight of the paraffinic gasoil.

4. Use according to any of Claims 1 to 3 wherein the paraffinic gasoil is selected from a Fischer-Tropsch derived gas oil and a hydrotreated vegetable oil (HVO) derived gasoil, and mixtures thereof.

5. Use according to any of Claims 1 to 4 wherein the paraffinic gasoil is a Fischer-Tropsch derived gasoil. 6. Use according to Claim 4 or 5 wherein the Fischer-Trospch derived gas oil is present at a level of from 10 %v/v to 100 %v/v, based on the total diesel fuel

composition.

7. Use according to any of Claims 4 or 6 wherein the Fischer-Tropspch derived gas oil is present at a level of from 50 %v/v to 100 %v/v, based on the total diesel fuel composition .

8. Use according to any of Claims 4 to 7 wherein the

Fischer-Tropsch derived gas oil has a kinematic viscosity at 40°C of in the range from 2.0 to 5.0 mm2/s and a density in the range from 0.76 to 0.80 g/cm3.

9. Use according to any of Claims 1 to 8 wherein the diesel fuel composition additionally comprises a diesel base fuel.

10. Method for reducing the build up of deposits in an Exhaust Gas Recirculation (EGR) system of a compression ignition internal combustion engine, which method comprises a step of introducing into said engine a diesel fuel composition which comprises a paraffinic gasoil.