Oil change

Drain plug copper seal size: 18mm (early type, plug with 10mm square socket) or 16mm late type, (plug with 8mm square socket).

Oil filters: On all Renault engines manufactured up to July 1984, a 3/4"-16 UNF thread was used. Engines built from this date onwards used a M20x150 thread (identified by a yellow sticker on the rocker cover).

Check carefully if in doubt. M20 filters will bolt on 3/4" UNF unions but will be too loose, while 3/4" UNF filters will not bolt on later M20 unions.

Some earlier cars do not have a filter as standard, but it is possible to remove the plug in that location and substitute a threaded union. This is a bona-fide R4 spare whose part number was 77 00 532 934. It may be difficult to source, but a scrap engine may provide a suitable part.