Thanks for the heads up on that one, my A4 seems to like the 5W40 over the 0W30 (i.e. with GC 0W30 my car uses about 1 qt in 5,000 miles; with BC 5W40, it only used about 1/2 quart).
But, I refused to pay the Audi stealership $8.50 a quart; now I have another choice. Thanks again!