There are posts on oils ad nauseam in this forum.
Don't forget that David is an engineer and fastidious with it. Don't get me wrong, he is the ONLY man I ever want to work on my XT (other than me) but ask yourself what his XT's get used for, he organises racing and tourist trips to north Africa, a tough, hot environment and as he is in business he needs to keep his service intervals as long as possible.
I have a 2003 XT660E with >20k [mostly road] miles. I use Mobil S (semi-synth 10-40) that costs me ~£15 a gallon. I fully expect another 20k (and more) trouble free miles. The most important thing about oil is regular changes, but I find the recommended 6k mile interval perfectly acceptable for my usage with this oil.
I have an oil temperature dip stick. Normal running is at 90C, never seen it hotter than 120C after a 70 mph motorway run from Edinburgh to Coventry.
Yes, millers crv is great oil, and Dave really knows his stuff but, as ever, it's a matter of horses for courses.
PS: I know Dave lurks round here sometimes so perhaps we will see a post telling me just how wrong I can be
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