I've got an '04 Suzuki SV650 (had an '03 but crashed it) and have been using Delvac 5W-40 in it as per many recommendations. I can no longer get it where I live. Rotella T synthetic is suppose to be just as good. These two are the highest recommended oils for motorcycles like mine. I found Rotella T 0W-40 at a local supplier and figured I would switch to it. Suzuki recommends 10W-40 but I been told the Delvac 5W-40 more than covers me. I figure the 0W-40 Rotella would be more than sufficient as well. Opinions?