Best oil in '05 R1200RT?

[mercator1]

When I bought this used '05 RT last summer, I immediately changed the oil, but the only thing I had on hand was some of my brother's best quality Honda oil he uses in his Goldwing. I've put about 2500 miles on since then, and wanted to change it before the riding season gets underway. I've read something about a foaming problem on those bikes with some oils , and wanted a recommendation for the best oil from some of you long time BMW riders.

Thanks.

[jdubeemer]

SPECTRO 4 20/50. This is what BMW re-labels for their oil. Or if you want a synthetic blend use Golden Spectro. Cycle gear markets this brand. They also stock K&N oil filters for BMWs.