CCP NCC is changing the rules for excluding Brent and Light Sweet Crude Oil futures from the inter-month spread shortly before the expiration:
Number of settlement periods* before the futures expiration for its exclusion from the inter-month spread
BRENT oil futures
2 settlement periods
4 settlement periods
Light Sweet Crude Oil
1 settlement period
3 settlement periods
*Settlement period means either:
New rules will be applied starting with the expiration of BR-4.20 and CL-3.20 futures and subsequent futures contracts on respective underlying assets.
The rules for excluding futures contracts on all underlying assets from the inter-month spread shortly before the expiration are available on the website.