I can't say for sure. Claims are claims, and the distributor in Blue Area said after taking a look at my vehicle that I should be good for 15k provided I'm using good filters. Honestly, that sounds too good to be true. But I'm keeping my fingers crossed. I would be disappointed if it lasted less than 10k. The only way to check is to use it once and see, what's the most one would lose?
I've only driven about 500 kms since switching from Zic 0W30 Synthetic, but to be honest, I started noticing with Zic even that early on that I wasn't going to be happy, and changed at 800kms. Maybe it was how thin the Zic oil was, maybe it was a mismatch for my 2JZ (recommended oil viscosity is 5w30 synthetic).
One thing to note is that when you add Ceratec, your oil will have a light brownish shade. That's the way it is supposed to be, after all, one of the top rated oils in the world, Royal Purple, is actually purple in color!
Will keep reporting.
Cheers.
Rao.