RevRider,
I checked the VOA and see what you are talking about. MX4T, according to the Cat tests (I assume that is what you were talking about) shows a Moly content of 91
http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000310
However, Sportrider says MX4T has an "undetectable amount" (they used Analysts Inc for their VOA).
see chart:
http://www.sportrider.com/tech/146_0310_oil/
What is equally interesting is that earlier in the article it states that Moly won't cause your clutch to slip.
So someone's numbers are wrong. Or perhaps Mobil 1 changed the formulation after 2003 (when the sportrider article was written).
If indeed they are the same moly content, I would agree with your point that the gold cap Mobil1 would work be fine also. Sportrider seems to think that Moly won't have an effect on your clutch. I would probably say that if your clutch is marginal, moly might put it over the edge. So I think there is truth i n both points of view. There are so many factors (like how hard you ride, spring strength, engine mods, etc.) that can play into whether your clutch slips or not, I beleive that moly is a contributor but probably not a major one.
Either way, it sounds like you could use the gold cap oil if you wanted to. It's not something I would do as I prefer motorcycle oil in my motorcycles. But, as I said before, even Harley says you can use Diesel engine oil in the shop manual (both in the 1996 Road King and 2002 Fat Boy shop manuals).
Then again, Harley Davidson was adamant that synthetic wasn't good for their engines. My mechanic, who I really trust, was equally passionate about this topic and said synthetic would cause flat spots on needle bearings. As much as I trust the guy to wrench on my bikes, I'll take the word of the lubrication engineer that has a PHD after his name over my mechanic. Hence, my Harleys have had synthetic in them since the first OCI.