LONDON, June 13 (Reuters) - Russian Urals crude weakened in the Mediterranean due to weak refining margins on Monday, keeping the arbitrage from Northwest Europe shut although it had been thought to open up. URALS * Vitol sold 80,000 tonnes for 2-6 July loading to ENI at dated BFOE minus $2.05 a barrel cif. Friday's bid level was dated minus $1.85. * "Northwest Europe is around minus $2.40, so the arbitrage closed on that," a trader said. * On Friday, some traders said the arbitrage to ship Urals crude from Northwest Europe to the Mediterranean could open up due to the fall in the north. * The spread between 80,000 tonne and 100,000 tonne cargoes were little changed from late last week around 65 cents per tonne. * Urals activity was relatively quiet due partly to the public holiday in Russia. MIXED SIGNAL ON LIGHTS * Light crude oil grades traded thinly but spot premiums were steady-to-firmer despite traders' expectation. * Traders said CPC Blend probably traded at dated BFOE plus 80 cents per barrel. * Azeri Light was around dated plus $4.00/$4.30 cif. * Most traders said sweet crude prices have peaked as distressed barrels of West African crude was offered into the Mediterranean. * Vitol offered Oso Condensate at dated plus $2.45 a barrel and Bonga at dated plus $4.20 a barrel for early July cif Rotterdam or Lavera. * On the other hand, Mediterranean light crude might benefit from the force majeure on Bonny Light. [ID:nLDE75C179] REFINING MARGINS * Oil product prices lagged behind the sharp rise in ICE Brent crude prices. * European gasoline's crack to dated Brent dipped to a three month low of around $2.40 a barrel. ICE gas oil futures' crack was $12.51 a barrel. * With high sulphur fuel oil's crack fell to about minus $20 a barrel, overall complex refining margins in the Mediterranean fell to minus $2.99 a barrel, Reuters model showed. (Reporting by Ikuko Kurahone)

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