You're gonna love PU. I've got pics around somewhere (I think ToyotaNation) of my Corolla's internals after about 2500 miles with PU (which I just changed out tonight after about 2750, figuring it had done all it was going to do; replaced it with Rotella T6 5w40 and 25% M1 0w20 to target different "engine dirt"). The [censored] this was spotless, I tell ya. While I don't have "before" shots, I do know the car was not well maintained and the oil did darken up pretty quick from about the 1200 mile mark to the tile I took it out. It's still got some life let on it, I'm sure, so I'm gonna do a UOA on it and consider running it for 3k in my wife's Civic for her next OCI.
Only switching to the Rotella/M1 blend because, while the PU did wonders for varnish (there was literally none) I don't think it's gonna do much more for my (still slightly stuck) ring packs or oil return holes. Considering that I'm talking about an 8th gen Corolla here, with the oil return hole (clogged, leading to burning oul) issue, I'm changing things up a bit in hopes of avoiding a partial rebuild. So far, burning is down to a reasonable level (a cup or less in 3k, down from a little over a quart in the same time) and I attribute that improvement to a combination of the PU and my driving it hard while it was running the PU. If I don't see any improvement with this blend, I'm gonna attribute the current (very reasonable for a vehicle with 166k on it) amount to leadfoot-induced ring deflection.
Bringing it back around, your engine will be very pleased with PU, and so will you. The strategy of alternating different brands (with different add packs) is very similar to what I'm doing to try and completely clean up this engine, and I think you'll likewise be pleased with the effects of that plan, as well. I would send a sample of that Defy to Blackstone for a OUA, but I'm guessing that 3.1 wouldn't have minded another 2300 miles of it, or at least taking it up to 6k. You can run the PU for as long, or longer, but like I said I'd get a OUA on that Defy to be sure.