UPDATE 1-Polish PKN Q3 beats expectations on one-offs,retail

* Q3 net profit at PLN 931 mln, versus expected 793 mln

* Booked over 1 billion zlotys on one-offs

* Retail brought 363 million zlotys in EBIT (Adds details, background)

WARSAW, Nov 12 (Reuters) - Poland's leading refiner PKN Orlen's PKNA.WA third-quarter net profit jumped more than expected, driven by one-off gains on inventories and loan adjustments.

PKN's net profit reached 930.6 million zlotys ($338 million) in the quarter, above the 793 million zlotys expected by analysts and many-fold above the 21.1 million zloty profit it posted a year earlier.

PKN booked 307 million zlotys in gains thanks to an increase in value of its oil inventories, which tracked rising oil prices CLc1. Zloty strengthening added an additional 726 milion zlotys through FX-denominated loan adjustments and lower liabilities.

Besides the one-offs, PKN's retail operations in Poland, where oil consumption so far has remained resilient to the global crisis, contributed positively to the results with 363 million zlotys in operating profit.

PKN owns the top retail gas network in the European Union's largest ex-communist member, with over 1,800 stations.

Non-cash events and retail operations offset poor operating results on PKN's core business, which was hurt by dropping refining margins and narrowing Ural/Brent differential.

The gasoline refining margins were down 3.2 percent, diesel margins sank 73 percent and the differential was down 83 percent in the quarter, PKN said.

PKN's operating profit dropped to 423 million zlotys in the quarter with revenues down to 18.6 billion zlotys. (Reporting by Patryk Wasilewski; Editing by Gary Hill)