It's eight quarts, not eight and 1/2 quarts (which is what the service manual and the computers at service shops say). They put too much in. Iv'e been doing my own oil changes since 2009. I put in eight quarts, period. If I put in 8 1/2, I get the HI alarm just like you are. This was the case with all three Roadsters. My current SE lit the "HI" light on the way home when I bought it, cause the former owner went to PEP BOYS.