I'm kind of slow. At the MMO-recommended 4oz per 10gal, does that make the engine digest 3.125% or .3125% ? Because that might be significant or no big deal. Depending. But it's still LARD?
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I'm with you that there is no objective statistically significant evidence that MMO does anything for either stuck valves or for that matter, lead scavenging, although it DOES have a tiny bit of TCP in it, which is used for lead scavenging. Multiple anecdotes do not equal data - I've NEVER used MMO in my engine over a 15 year period and have never had a stuck valve - what does that prove? But there's no evidence that it does any harm, either, unless you really don't like the smell (which I don't).
With respect to the question of "lard", the MSDS for MMO:
http://www.audiosears.com/MSDS/FS043...tery%20Oil.pdf
indicates five total components, none of which are animal derivatives. There's no lard in MMO, according to the folks that make it.