C3 is a catalyst oil ( low Sulphated Ash, Phosphorus and Sulphur), so probably OK.....
This is from oil labeling explained on the 'honest John' site,
C3-04 Petrol and light duty Diesel engines, based on A5/B5-04 mid SAPS, two way catalyst compatible, Higher performance levels due to higher HTHS.
You might also want to look here ................
http://www.oilspecifications.org/acea.php