Picasso Oil Filter Seal not effective

Hi! C3 Picasso 2015 1.6 HDi. Does anyone have experience of a square section filter oil seal not sealing correctly? I changed the filter yesterday and the seal was not effective! I noted that the removed item was a round cross section O ring which I had to reuse! I used a Purflux L343D which is supposed to be compatible with the C3. Any comments appreciated

gdn1947 wrote: ↑Wed Feb 02, 2022 2:33 pm Hi! C3 Picasso 2015 1.6 HDi. Does anyone have experience of a square section filter oil seal not sealing correctly? I changed the filter yesterday and the seal was not effective! I noted that the removed item was a round cross section O ring which I had to reuse! I used a Purflux L343D which is supposed to be compatible with the C3. Any comments appreciated

Hello

I think they may all be similar over the years. There is a large diameter square section 'o-ring' that seals the housing to the oil filter housing.

It is best to lubricate the square section seal with some fresh oil and tighten it to the correct torque - that is not too tight a the seal will deform.

The lubrication helps the seal take is shape as it is tightened.

The seal is often supplied with a new filter, but you can get away with re-using the previous without any noticeable leakage.

The answer is that I unwittingly bought a filter designed for the Euro 4/Euro 5 generation of engine as fitted to my other car, a Xsara Picasso 1.6 HDi 2005. The correct filter for the 1.6 HDi fitted to my 2015 C3 Picasso ie Mahle OX171/2D1 is designed for the Euro 6 generation which includes a redesigned cap to accommodate the circular o ring . Wish the filter manufacturer had made that clear on the packaging!