LONDON, Jan 30 (Reuters) – Offers for Nigerian and other lighter crude grades continued to rise on Monday as European gasoline refining margins neared three-month highs.

* More frequent bidding from South Asia after falling earlier in the month and in December also supported differences, traders said.

* Nigerian Qua Iboe crude was quoted at dated Brent plus $3.50 a barrel and up while Escravos was quoted at dated Brent plus $5.50.

* Zafiro Crude Oil from Equatorial…