Ah, that's the rub -- the Mobil 1 EXTENDED doesn't have an energy star and it makes no claims for "extra anti-friction additive protectants" or claim any other sort of slickness additive packages. All they admit to is adding 50% more of their "SuperSyn" additive which is intended for supporting the longer service drain intervals.
What it does claim is "excellent engine cleanliness and wear protection in high temperature conditions and during longer drain intervals".
One is tempted to say that it is just Mobil 1 with extra oil service life additives (but I certainly don't know enough to make any claims for it, that's why I was asking the group if anyone had used it yet and did you get any clutch reactions to it?)
As far as long drainage intervals go, I doubt I'd put 5,000 miles on my thumper in a year but I'd likely want to change my oil and my filter every spring irregardless.
I do like the thought of being relatively heat-proof with my motor oil as cooking a crankcase of oil on a long upgrade in the NC mountains killed a Ford for me many years ago (and started my total preference for synthetic oils from that point forward).
Synthetics don't break down all that easily anyway -- if blow by makes your oil get dark and you have an additive package that can support a V8 for 15,000 miles, should you have to worry that your 650 cc single cylinder's oil is dark?
What sort of particle size does the EMCO oil filter remove from the oil anyway?
Oldfeller
P.S. here's a 3rd party test of the stuff -- interesting.
http://neptune.spacebears.com/cars/stories/mobil1.html
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