It's $10 for s/c oil and doesn't have to be changed very often at all. Just buy it from sdd or zzp. You think gm spec'd their oil cause they were trying to make money? No they did it because that's what works best.
Just wait till that 10w30 overheats and starts coking all over the inside of your snout. It's a worse smell then s/c oil. You people are idiots.
I've been rockin it for months just fine, but when I change the oil next time I mod it will most likely be with the recommended s/c oil.