Hi mojo baby,thanks for the oil filter thread.Interesting,I think I will leave as is as the factory intended and change frequently. The R4 (1126) is only used for classic rallies and shows!Hi Flexjoint, you might find this post interesting, from some time last year. Apparently it is possible to fit a filter, so don't worry!
https://www.renault4.co.uk/forum/threads/no-oil-filter.8896/#post-60697