I've been using WIX (ALS) for sometime now and when the viscosity (cST 100c) numbers hit 11.1, 11.4, 11.6, (2000 to 4000mi) and 10.6 (at 4000mi) I get yellow caution flags. The 10.6 had the comments of "change oil and filter if not already done so". Another rider of the same identical machine sends his 6000 mile sample to Blackstone, gets a viscosity of 8.3 (down in 20W) and a comment to try the next run to 8000 miles! There have been at least one other similar report done by Blackstone at 6000 mile with the comment that the oil was still ok. Metals and contaminants in all these reports were "normal". Question is, how can two labs be so far apart in judgement? I'm confused! My 10.6 and the 8.3 above were done on Can Am's new ACE 1330cc motor (3 cyl, shared sump) which the company says is good for 9300 miles between changes. Unless I get some convincing evidence otherwise, I'm going to change my oil at no more than 4000mi, maybe sooner.