Here in SA, the E46 M3 oil is also the 10W60 - now that Castrol RS is down to a 5W60, I believe this is what is used.
BMW LONGLIFE is a spec I see on very few of the oils. Yes, it is actually printed on the oil container label. But those that you do see it printed on, are the pricier, good stuff
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Example. Mobil 1 5W-40 (French produced), Petronas Syntium 5W-40 (Malaysian), Fina First, Castrol RS and SLX - all these being Group 4 PAO's I believe. We don't have much grades lower than 5W-30 here ( and only 2 - 5W30 Caltex Havoline Energy and 0W30 Casrol SLX) - rest are 40 weights or higher). I estimate sales of these 30 weight multigrade oils at lower than 1% (if that) of total market.
BTW, E46 BMW's oil service intervals are variable, based on the check lights, but on average, they are around 24 000 km (15000 miles).
I think the E46 M3's oil intervals, due to, shall we say, "enthusiastic" driving
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, works out around 16000km.