Asia stocks head for 6th week of gains

* The euro was steady at $1.3615 after dropping overnight on fears Greece's fiscal crisis may be a harbinger of what is in store for other economies in Europe.

* U.S. oil futures were down 0.4 percent to $81.90 a barrel, with expectations the U.S. dollar would keep appreciating against the euro weighing on crude prices.

(Additional reporting by Aiko Hayashi in TOKYO; Editing by Jan Dahinten)