Jay, I believe DLC is referring to using a blend of synth and conventional (already blended by the manufacturer). There are quite a few available in the U.S. Mobil came out with a blend earlier this year.
I tried Mobil1 5w30 in my 97 OB Sport and my wife's 99 OB. There were leaks around both filters and leaks around the OB's oil pan.
Read more in my reply to this post:
http://www.i-club.com/ubb-files/Foru...ML/000074.html
Dennis