LONDON, Aug 30 (Reuters) -U.S. WTI Midland crude differentials were steady on Friday after sellers raised their offers but buying interest did not follow suit, while North Sea grades were unchanged after a lack of pricing indications.

PLATTS WINDOW

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

* WTI Midland: Unipec offered and withdrew a CIF Rotterdam Sept. 28-Oct. 2 cargo at dated Brent plus $3.00, higher than Thursday's value of dated plus $2.75. There were two other offers, one of which was the same and the other at plus $3.15.

* In the absence of higher bids, WTI Midland's value is steady at dated Brent plus $2.75, equal to around dated plus $1.84 on a FOB equivalent basis, Reuters calculations showed.

* With no bids or offers of North Sea grades that are part of the Brent benchmark, WTI remained the cheapest grade underpinning the benchmark on Friday.

Reporting by Alex Lawler; 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