LONDON, Sept 18 (Reuters) -North Sea Forties and U.S. WTI Midland both traded in Wednesday's North Sea window, with the former trading below Tuesday's levels and the latter slightly higher.

PLATTS WINDOW

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

* Forties: Mitsui bought a cargo with Oct. 16-18 dates from BP at dated Brent plus $1.30 FOB Hound Point. The cargo was sold on a one-cancels-the-other basis with an Oct. 15-19 cargo that BP was also offering.

* Forties: The deal level was slightly below where Mitsui had bid for Forties on Tuesday, for Oct. 4-13 at dated Brent plus $1.55.

* WTI Midland: Trafigura sold an Oct. 8-12 cargo to Petroineos at dated plus $2.65 CIF Rotterdam.

* WTI Midland: Petroineos bid for another cargo with the same dates at dated plus $2.65 CIF Rotterdam, but no sellers stepped forward.

* The deal and bid level equated to around dated plus $1.78 on a FOB basis, Reuters calculations showed.

* In the previous session, Petroineos had bid for Oct. 7-11 dates at dated Brent plus $2.55 CIF Rotterdam.

* Ekofisk: Mitsui bid for a Sept. 30 - Oct. 2 cargo at dated plus $2.45 FOB Teesside.

* Ekofisk: Petroineos bid for an Oct. 11-13 cargo at dated plus $2.60 FOB Teesside.

* On Tuesday, Gunvor bought an Ekofisk cargo from BP Oct. 11-13 at dated Brent plus $2.20 FOB.

* Johan Sverdrup: Equinor offered a cargo with Oct. 9-11 dates at dated Brent minus $1 FOB.

Reporting by Robert Harvey; Editing by Kirsten Donovan

 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