Did you settle on using the same 504091563 oil filter? Done an oil change 2 months ago (which used the Iveco oil filter) have noticed still plenty of life in the oil (after 15,000kms) - not as thick as the prior oil change when using the black Fiat filter. Maybe the change in oil brand was a factor? (Total C2 ACEA) - prior was Fiat Selenia WR C2.
Can anyone share what brand / type of oil they are using in their Fiat Ducato motors?
Any 5W/30 DPF compliant oil is usable. I use Shell Helix Ultra 5W/40 - the grade specified for use with DPF. There is no detriment to the engine even if using non-compliant DPF oil. The only detriment is to the DPF itself. I refuse to pay the extortionate prices charged by Fiat for their oil and filters. Plenty of good filters and oils out there.
Ian.