LONDON, Oct 17 (Reuters) -US WTI Midland was offered lower in the Platts window on Thursday, while North Sea grades Forties and Ekofisk held steady on the day amid lacklustre selling interest.

PLATTS WINDOW

* Indications are on a free-on-board (FOB) basis unless marked as cost, insurance, and freight (CIF) or delivered at place (DAP).

* No deals, a trade source said.

* WTI Midland: Phillips 66 offered a cargo with Nov. 9-13 dates at dated Brent plus $1.75 CIF Rotterdam.

* The offer equated to around dated plus 82 cents on a FOB basis, according to Reuters calculations.

* WTI Midland was last in the window on Oct. 10, when Gunvor bought an Oct. 29 - Nov. 2 cargo from BP at dated plus $1.90 CIF.

* Forties: Glencore offered two cargoes on a one cancels the other basis, loading Nov. 10-12 at dated plus 45 cents and loading Nov. 13-15 at dated plus 50 cents.

* On Wednesday, Glencore bought Nov. 10-12 dates from Shell at dated Brent minus 5 cents.

* Ekofisk: Glencore, BP and TotalEnergies all offered cargoes, the lowest of which was at dated plus $1.45 FOB by BP for Nov. 1-3 dates.

* In the previous session, Equinor bought a cargo with Oct. 31 - Nov. 4 dates from BP at dated Brent plus $1.55 CIF Rotterdam, which equated to around dated plus 77 cents on a FOB basis according to Reuters calculations.

* Forties therefore remained the cheapest grade and set the dated Brent value.

Reporting by Robert Harvey;Editing by Elaine Hardcastle

- NORTH SEA CRUDE OIL DIFFERENTIALS AND OUTRIGHT PRICES: 0#BFO-DIF 0#C-E Dated BFO BFO- Brent BFO-BRT BFO-E Forties BFO-FOT FOT-E Oseberg BFO-OSE OSE-E Ekofisk BFO-EKO EKO-E Monthly North Sea crude loading programmes O/LOAD OPEC OPEC NSEA North Sea CRU crude oil PROD oil products DRV derivatives PRO/E European products OILOIL NYMOIL, IPEOIL, OILSPD, OILARB CRDWLDPRODEUR, PRODUS, APROD ENERGY energy speed guide CRUDE/1 crude speed guide