For a few weeks, I've been planning on using XD-3 0w40 in my 93 Altima when I do an oil change, but just a few hours ago I got to thinking, what would I do if I need to add a bit of makeup oil? I don't want to pay 20 bucks for a jug of oil if all I need is a half-quart or whatever, and I don't think I'd be able to buy a single quart at an Esso bulk distributor. So then the little lightbulb went off in my head. I should give GC a try. It's quite easy to find around here, two Canadian Tire stores stock it, and the Walmart does too. Sure, it'll cost me about 10 bucks more for 4 quarts of the GC than XD-3, but if I can run the OCI to, say, 7000-8000 kms, then I'd probably save a bit of money by not having to change the oil so often. I like to wring my Altima's engine a bit in the gears, I just like the way it sounds at high RPM's . What do you folks think of my decision?